哺乳动物的繁殖介绍【英文】
哺乳动物介绍 英文
Hello everyone! Today our group is going to give a presentation about mammals.As one of species evolves from late Jurassic period(侏罗纪晚期), mammalians’ brains are more developed and specialized than any other class of animals. Mammals are characterized by mammary glands(乳腺) that are modified for producing milk. All mammals have special sweat glands(汗腺) and hair.Here are five mammals we want to share with you:The first of are pandas. Panda is one of the most precious animals in the world. With white and black color, these animals are very fluffy and a little clumsy. Known as Chinese treasures, panda is a kind of animal that is endemic to China, they’re living in Sichuan province. Bamboo is their favorite food. Because of its cute appearance, panda is deep loved by the world public. 1961, WWF established its mark on the giant panda, the panda has become a symbol of the most important species conservation, also as a goodwill important representatives in the diplomatic activities in China.The second one is polar bear, the largest terrestrial carnivorous animal. The polar bear is a bear native largely within the Arctic Circle encompassing(围绕) the Arctic Ocean, its surrounding seas and surrounding land messes. It is the world’s largest land carnivore(食肉动物) and also the largest bear. It has thick fat and hair to stay warm, its white appearance on white snow is good protective coloration. It can move both on land and sea, thus it’s an advantage for a polar bear to catch food in such an extremely harsh climate. Nevertheless global warming has impact on the ice nowadays. The ice melts quickly in the two poles, which has a bad influence on polar bears. Their homes has been destroyed, the prey is also in reduction. We must take measures to protect these animals, for they’re in danger, they’re the treasure of nature.The third one is t he Roe Deer(狍子).The program of Dad, Where Are We Going has been very popular among many people, one of the period programs showed that these five pair fathers and children came to the northeast rural, and saw a cute animal——the roe deer, which make much more people aware of it. The roe deer is also called dwarf deer or wild sheep, which are herbivores(食草动物), feed on plants. The fur’s color of roe deer are usually straw yellow, there is white h aired in roe deer’s base of the tail, it looks really funny. In addition, the male roe deer have set of antlers(鹿角), but female roe deer don’t have, this is the way that how to recognize their sexes. The roe deer has very big and bright eyes, which makes it looks socuddly(可爱的). The roe deer almost live in open forest area, sometimes near the river valley. They rest in the forest during the day, take activities in the early morning or the late evening, because they are very timid and sensitive. they will run quickly if they finds you. As we know, there is one saying “Stupid Roe Deer” in the northeast area, it often be used to describe the people who is a little clumsy, and it’s gradually used to praise one person who is pretty and cute. But its own meaning is that the roe deer is so curious. When a hunter is chasing the roe deer, the roe deer will run very fast, but if the hunter stop to run after it, because of its curiosity, the roe deer will run back to the primary place to see what happened, the hunter do esn’t need or use great effort, then he can capture the roe deer very easily. How funny!The next one is Mongoose. Mongooses are primarily found in Africa, their range covering most of the continent. Some species occupy parts of southern Asia and the Iberian Peninsula. They are generally terrestrial mammals, but some are semi-aquatic, and others are at home inthe treetops. They normally have brown or gray fur, and a number of species sport striped(有条纹的) coats or ringed tails. Mongooses live in burrows(地洞) , feeding on small animals such as birds, frogs, insects, and worms. Some species supplement their diet with fruits, nuts, and seeds. Creative hunters, they are known to break open bird eggs by throwing them with their forepaws toward a solid object. Today effort has been done to control the number of this animal. As mongooses threaten the survival of various native species, particularly birds. However, in their natural environments, mongooses are currently threatened themselves due to habitat loss.The last one is sloth. Sloths are extremely slow-moving mammals found in the rainforest of Central and South America. There are two species of sloths: two-toed and three-toed. Most sloths are about the size of a small dog and they have short, flat heads. Their hair is grayish brown but, at times they look grey-green in color because they move so slowly that tiny algae grow all over their coats. Some sloths stay in the same tree for years. Their huge hooked claws and long arms allow them to spend most of their time hanging upside-down from trees. Since they have a slow metabolism(新陈代谢), they need very little food. They feed on fruit, leaves, buds, and young twigs(细枝). Sloths also sleep upside-down for up to 18 hours at a time. Mothers also give birth to babies upside-down. Babies cling to their mothers until they are able to take care of themselves. That’s all. Thank you!。
哺乳动物英语词汇
哺乳动物英语词汇English:Mammals are a diverse group of animals characterized by several unique features. One key characteristic is the presence of mammary glands, which produce milk to nourish their young. Mammals are also distinguished by having hair or fur covering their bodies, which helps with insulation and protection. Another defining trait is the presence of a neocortex in the brain, which is responsible for higher cognitive functions such as problem-solving and social interaction. Mammals give birth to live young rather than laying eggs, and they typically exhibit parental care towards their offspring. This care can range from nursing and grooming to teaching essential life skills. Mammals inhabit various ecosystems worldwide, from the depths of the ocean to the highest mountains and everything in between. They have adapted to a wide range of diets, including herbivory, carnivory, and omnivory, making them incredibly versatile in their feeding habits. Mammals play vital roles in ecosystems as pollinators, seed dispersers, predators, and prey, contributing to the overall balance and functioning of their respective habitats. From the mighty blue whale to the tiny Etruscan shrew, mammals encompass anastonishing array of sizes, shapes, and behaviors, making them one of the most fascinating groups of animals on Earth.中文翻译:哺乳动物是一类具有多种独特特征的动物群体。
哺乳动物介绍 英文
Hello everyone! Today our group is going to give a presentation about mammals.As one of species evolves from late Jurassic period(侏罗纪晚期), mammalians’ brains are more developed and specialized than any other class of animals. Mammals are characterized by mammary glands(乳腺) that are modified for producing milk. All mammals have special sweat glands(汗腺) and hair.Here are five mammals we want to share with you:The first of are pandas. Panda is one of the most precious animals in the world. With white and black color, these animals are very fluffy and a little clumsy. Known as Chinese treasures, panda is a kind of animal that is endemic to China, they’re living in Sichuan province. Bamboo is their favorite food. Because of its cute appearance, panda is deep loved by the world public. 1961, WWF established its mark on the giant panda, the panda has become a symbol of the most important species conservation, also as a goodwill important representatives in the diplomatic activities in China.The second one is polar bear, the largest terrestrial carnivorous animal. The polar bear is a bear native largely within the Arctic Circle encompassing(围绕) the Arctic Ocean, its surrounding seas and surrounding land messes. It is the world’s largest land carnivore(食肉动物) and also the largest bear. It has thick fat and hair to stay warm, its white appearance on white snow is good protective coloration. It can move both on land and sea, thus it’s an advantage for a polar bear to catch food in such an extremely harsh climate. Nevertheless global warming has impact on the ice nowadays. The ice melts quickly in the two poles, which has a bad influence on polar bears. Their homes has been destroyed, the prey is also in reduction. We must take measures to protect these animals, for they’re in danger, they’re the treasure of nature.The third one is t he Roe Deer(狍子).The program of Dad, Where Are We Going has been very popular among many people, one of the period programs showed that these five pair fathers and children came to the northeast rural, and saw a cute animal——the roe deer, which make much more people aware of it. The roe deer is also called dwarf deer or wild sheep, which are herbivores(食草动物), feed on plants. The fur’s color of roe deer are usually straw yellow, there is whi te haired in roe deer’s base of the tail, it looks really funny. In addition, the male roe deer have set of antlers(鹿角), but female roe deer don’t have, this is the way that how to recognize their sexes. The roe deer has very big and bright eyes, which makes it looks socuddly(可爱的). The roe deer almost live in open forest area, sometimes near the river valley. They rest in the forest during the day, take activities in the early morning or the late evening, because they are very timid and sensitive. they will run quickly if they finds you. As we know, there is one saying “Stupid Roe Deer” in the northeast area, it often be used to describe the people who is a little clumsy, and it’s gradually used to praise one person who is pretty and cute. But its own meaning is that the roe deer is so curious. When a hunter is chasing the roe deer, the roe deer will run very fast, but if the hunter stop to run after it, because of its curiosity, the roe deer will run back to the primary place to see what happened, the h unter doesn’t need or use great effort, then he can capture the roe deer very easily. How funny!The next one is Mongoose. Mongooses are primarily found in Africa, their range covering most of the continent. Some species occupy parts of southern Asia and the Iberian Peninsula. They are generally terrestrial mammals, but some are semi-aquatic, and others are at home inthe treetops. They normally have brown or gray fur, and a number of species sport striped(有条纹的) coats or ringed tails. Mongooses live in burrows(地洞) , feeding on small animals such as birds, frogs, insects, and worms. Some species supplement their diet with fruits, nuts, and seeds. Creative hunters, they are known to break open bird eggs by throwing them with their forepaws toward a solid object. Today effort has been done to control the number of this animal. As mongooses threaten the survival of various native species, particularly birds. However, in their natural environments, mongooses are currently threatened themselves due to habitat loss.The last one is sloth. Sloths are extremely slow-moving mammals found in the rainforest of Central and South America. There are two species of sloths: two-toed and three-toed. Most sloths are about the size of a small dog and they have short, flat heads. Their hair is grayish brown but, at times they look grey-green in color because they move so slowly that tiny algae grow all over their coats. Some sloths stay in the same tree for years. Their huge hooked claws and long arms allow them to spend most of their time hanging upside-down from trees. Since they have a slow metabolism(新陈代谢), they need very little food. They feed on fruit, leaves, buds, and young twigs(细枝). Sloths also sleep upside-down for up to 18 hours at a time. Mothers also give birth to babies upside-down. Babies cling to their mothers until they are able to take care of themselves. That’s all. Thank you!。
哺乳动物英文介绍
Origin
Mammals were not abundant during the Mesozoic era. Fossils of the first mammals are scarce thus indicating that they were not as abundant. The Cenozoic era is named the age of mammals, for this is the time which mammals rapidly started to increase
14
Marsupials
• Marsupials give birth to tiny immature young that crawl to a pouch on the mothers belly immediately after they are born.
15
They attach themselves to milk secreting nipples nursing until they are mature enough to survive outside the pouch.
6
Characteristics • Mammals are endothermic • Mammals have hair • Well-developed brains
7
Characteristics
• Mammalian heart has 4 chambers • Mammals have a muscle , the diaphragm that aids in breathing
8
Characteristics
• Mammals have single lower jaw • Most species have 4 different types of teeth
介绍猪是哺乳动物作文英文
介绍猪是哺乳动物作文英文英文：Pigs are mammals that belong to the family Suidae and the genus Sus. They are domesticated animals that are commonly raised for meat, as well as for their skin and other by-products. Pigs are known for their intelligence and social behavior, and they are often kept in groups or herds on farms.Pigs have a reputation for being messy and dirty animals, but in reality, they are quite clean. They designate specific areas for sleeping, eating, and defecating, and they will not soil their living space if given the opportunity to keep it clean. In fact, pigs are often compared to humans in terms of their cleanliness and intelligence.In terms of their physical characteristics, pigs are known for their stout bodies, short legs, and snouts. Theyhave a keen sense of smell and are able to use their snouts to root around in the ground for food. Pigs are omnivores, which means they eat both plants and animals. They have a varied diet that includes grains, fruits, vegetables, and even small animals if given the opportunity.Pigs are also known for their reproductive capabilities, as they are able to produce large litters of piglets. A sow, or female pig, can have up to 12 piglets in a single litter, and they are known for being attentive and protective mothers.Overall, pigs are fascinating animals that play an important role in agriculture and food production. They are intelligent, social, and adaptable creatures that have been domesticated for thousands of years.中文：猪是哺乳动物，属于猪科和猪属。
哺乳动物英文介绍【精品】
1
Class Mammalia
•Includes 4000 species
•Most dominant land animals on earth. •Two identifying characteristics:
•Hair/fur
•Mammary glands which produce milk
– Tongue protrudes like a snake
• Nocturnal • Terrestrial and burrowing • Females normally lay only one egg
11
Monotremata
Duck-billed platypus
Spiny anteater
5
• Mostly viviparous (live birth) • Females secrete milk from mammary glands to feed newborn young.
Characteristics
6
Distinguishistinguish them from other invertebrates: hair and production of milk.
8
Order Monotremata
• Oviparous or egg laying mammals • Only 3 in existence • Duck-billed platypus and two species of spiny anteaters called echidna. • Not completely endothermic (their body temperature is lower and fluctuates more than other mammals) • Mammae without nipples • Edentulous as adults • Limbs modified for swimming or digging • Australia and New Guinea
生物竞赛讲座之哺乳
l 皮肤腺：皮肤腺极发达。包括皮脂腺，保持毛和皮肤的润泽；汗腺，调节体温和排泄器官；乳腺，是变态的汗腺；气味腺，也是变态的汗腺，用于种间识别和吸引异性，或防御作用。
l 鳞片、爪、指甲、蹄和角：绝大多数哺乳类指趾端具爪，为表皮角质鞘。在灵长类，爪演变为指甲；在有蹄类，爪演变为蹄。体表结构坚硬的如穿山甲的大型表皮角质鳞片。角为有蹄类所具有，主要分2类，即洞角（由真皮的骨质心和表皮角质鞘组成，无分叉，终生不脱换，雌雄均有，如牛羊角）和实角（为真皮骨质角，分叉，多数为雄性具有，每年脱换一次，如鹿角）（图）。
l 心脏分为4室，多氧血和缺氧血完全分开。 l 血液中红细胞无核，呈双凹型（与其他
6．循环系统（图）
1
l 排泄系统由肾脏、输尿管、膀胱和尿道组成。此外，皮肤也是哺乳类特有的排泄器官。
2
l 肾脏的实质中有许多泌尿的肾单位。肾单位由肾小体（由血管球和肾小囊组成，形成原尿）和肾小管（形成终尿）组成。
哺乳：母体具有乳腺（高度特化的汗腺）和乳头，乳头的个数通常与一胎所产胎儿数相当。卵生的原兽亚纲动物具乳腺但无乳头，母兽孵化出的幼兽舔食母兽腹部乳腺区分泌的乳汁。
毛及其他皮肤衍生物 l 皮肤：表皮和真皮均加厚，表皮的角质层发达（图）。
l 毛：（1）为哺乳类所特有。是由表皮角质化形成，与角质鳞片及羽毛为同源结构。（2）由毛干和毛根组成：毛根埋在皮肤深处的毛囊内，外被毛鞘，毛根末端膨大部分为毛球。毛球基部即为真皮构成的毛乳头，内具丰富的血管，供应毛生长所需的营养物质。在毛囊内有皮脂腺的开口，所分泌的油脂能滋润毛和皮肤。毛囊基部有竖毛肌附着。毛干是由髓质、皮质和鳞片层构成，髓质疏松多孔（保温），皮质坚韧有弹性（决定毛色），鳞片层为角质细胞（具保护作用）。（3）根据毛的结构特点，可分为针毛（长而坚韧，有毛向，具保护作用）、绒毛（位针毛下层，无毛向，毛干的髓部发达，保温性强）和触毛（特化的针毛，起触觉作用）。（4）毛在春秋季有
动物的生殖与繁殖【英文】
•Some die when there is no food or water.
If animals do not reproduce,
Extinct
• they will become…
How do animals reproduce?
Animal Reproduction
The egg of the female animal is fertilised by the sperm of the male animal.
The Chinese University of Hong Kong
Postgraduate Diploma of Education (Primary) DEP5114A (2000-2001) Professor Mak Se Yuen
Producer: Fong Pui Ting Karen (99236240)
An:
1. By laying eggs
The mothers lay the fertilised eggs and hatch them.
They lay a large number of eggs each time.
Which comes first? Eggs or chicks?
9 April, 2001
The End
Thank you for watching !
What is inside a chicken’s egg?
•Shell •Egg white •Yolk •Embryo
2. By giving birth to the young
•The fertilised egg develops in the mother’s body and becomes an embryo. •The mother gives birth to the baby after a period of time. The newborn baby feeds on its
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
pengel@
1
Overview
• Characteristics of Mammals • Types of Mammalian Reproduction
– Monotremes – Marsupials – Placental
• Summary
/mammal/monotreme.html
pengel@
5
Marsupials
• Pouched Mammals • Live birth, but young are born underdeveloped • Crawl from birth canal and latch onto nipple, continue to develop in pouch. • Special structures
/OLD_WWW/opossuminfo.html
pengel@
10
Quick Review
• Placental mammals bear live young • Young develop in uterus • Long gestation period • Nourished by milk through nipples
– Nipples – Pouch
Red Kangaroo. Photo by Gerald and Buff Corsi, © 2002 California Academy of Sciences.
Wombat. Photo © 2005 Sharon Chester
• Include Kangaroos, koalas, wombats,
pengel@11来自• Mammals use sexual reproduction to produce offspring.
pengel@
8
Quick Review
• Monotremes lay eggs incubated by parents, and nourish underdeveloped young with milk, but have no nipples.
pengel@ 3
Characteristics of Mammals
• Warm-blooded • Have hair • Produce milk to nourish young • High metabolic rates • Single bone in lower jaw • Three middle ear bones
/media_ 461534650/Platypus.html
pengel@
9
Quick Review
• Marsupials bear live young • Offspring are underdeveloped and continue to grow in pouch, attached to nipple • Nourished by milk
pengel@
2
Sexual Reproduction Review
• Few offspring • Genetic variation • 2 parents produce haploid gametes • Gametes fuse to produce offspring • Offspring have characteristics of both parents, but are not identical to each other or to parents • Uses meiosis to produce gametes
pengel@
6
Placental Mammals (Eutheria)
• Give birth to live young • Long gestation period, young develop within uterus, nourished by placenta • Special structures – Uterus – Placenta – nipples
Yellow Baboon. Photo by H. Vannoy Davis, © 2002 California Academy of Sciences.
/medias_ 761561349/Mammal.html
pengel@
7
Quick Review
pengel@
/mammal/mammal.html
4
Monotremes
• Three living monotremes
– Duckbilled platypus – 2 species of Echidna (spiny anteater)
• Lays eggs, parent incubates • Special structures
– Eggs, milk, but no nipples
Echidna. Photo by Dr. Lloyd Glenn Ingles © 2001 California Academy of Sciences.