1 / 16

Types of Mammals

Types of Mammals. NB #161. 2 Main Groups:. Prototheria : monotremes Theria : marsupials & placentals. Monotremes. Egg laying mammals Retain eggs in their bodies for an extended time 5 species: duck-billed platypus & 4 species of echidnas (spiny anteaters). duck-billed platypus.

luyu
Download Presentation

Types of Mammals

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Types of Mammals NB #161

  2. 2 Main Groups: • Prototheria: monotremes • Theria: marsupials & placentals

  3. Monotremes • Egg laying mammals • Retain eggs in their bodies for an extended time • 5 species: duck-billed platypus & 4 species of echidnas (spiny anteaters) duck-billed platypus Short-beaked echidna

  4. Monotremes • “Monotreme”– means “single opening” • They have a cloaca instead of an anus, urethra, & vagina • Live in Australia & New Guinea • No nipples- excrete milk through mammary glands in the skin • Display parental care

  5. Monotremes • Lack teeth as adults (have molars as young) • Spur in the ankle- produces powerful venom in the male platypus • Bill on the head functions in electroreception Platypus video

  6. Marsupials (metatherians) • Young are carried in a pouch • Includes kangaroos, koalas, oppossums, wombats, & the Tasmanian devil Tasmanian devil koala kangaroo

  7. Marsupials • Most live in Australia & New Guinea • We have one here…. Do you know what it is? • Young are born early and then climb into their mother’s pouch to fully develop * The placenta does not develop Kangaroo baby * Young are called “joeys”

  8. Placental Mammals • Give birth to live and developed young * Nourish young with a placenta (organ developed during pregnancy for gas exchange, waste elimination, & nutrient uptake) • Includes elephants, manatees, anteaters, cattle, whales, badgers, dogs, & humans

  9. Placental Mammals • With the exception of the opossum, all mammals native to North America, Europe, Africa, and Asia are placental mammals (eutherians)

  10. Placental Mammals • Wide opening at the bottom of the pelvis for large, well-developed offspring

  11. Placental Mammals • Hippopotamus- large herbivores in sub-Saharan Africa • Closely related to whales • Spend most of their lives in water • Very aggressive- one of the most dangerous animals in Africa (humans are their only predators)

  12. Placental Mammals • Elephant- largest land animal • Large proposcis modified into a trunk (mostly used for grabbing items) • Incisors grow into tusks used for digging and fighting

  13. Placental Mammals • Tigers- largest cat species & third largest land carnivore (behind polar bear & brown bear) • Now highly endangered due to fur poaching

  14. Placental Mammals • Blue whale- largest animal to ever exist on Earth (98 feet long & 170 tonnes) • Teeth modified into large plates called “baleen”– eat tiny krill • Endangered due to whaling

  15. Placental Mammals • Manatees- also called sea cows • Large aquatic herbivores • Known to wipe out plants from an entire area • Slow moving- often killed by boats • Sailors used to confuse manatees with mermaids

  16. Placental Mammals • Primates- lemurs, bush babies, monkeys, gibbons, gorillas, chimpanzees, & humans • Opposable digits on the feet and/or hands • Humans- adapted an upright posture, ability to use and manipulate tools, bipedal locomotion, & highly complex brains • Homo sapiens- our scientific name!! (evolved as early as 195,000 years ago)

More Related