What Are Mammals? by Caroline Daniel https://padlet.com/cgdaniel811/9mk6jd6v7ook Cengage Biology 24.7 en-us 2018-04-24 00:35:17 UTC 2025-12-03 21:30:43 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Beartoy.png Mammal cgdaniel811 https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254645394 Animal with hair or fur; females secrete milk from mammary glands.]]> 2018-04-24 00:37:28 UTC https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254645394 Traits cgdaniel811 https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254645472
  • Name derived from Latin mamma, meaning breast 
  • Four-chambered heart 
  • Endotherms
  • Fur or hair helps them retain body heat

    • Only mammals have teeth of four different shapes
      • allows mammals to process a wider variety of foods than other vertebrates
    ]]>     2018-04-24 00:38:05 UTC https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254645472     Monotreme cgdaniel811 https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254646278 Egg-laying mammal.]]> 2018-04-24 00:45:15 UTC https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254646278 Marsupials cgdaniel811 https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254646373 Mammal in which young are born at an early stage and complete development in a pouch on the mother’s surface.]]> 2018-04-24 00:45:56 UTC https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254646373 Placental Mammals cgdaniel811 https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254646510 Mammal in which maternal and embryonic bloodstreams exchange materials by means of a placenta.]]> 2018-04-24 00:47:00 UTC https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254646510 cgdaniel811 https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254646587
  • Only three monotreme species survive, the duck-billed platypus and two kinds of echidna
  • Monotreme eggs hatch while young are still tiny, hairless, and blind
  • Young then cling to the mother or are held in a skin fold on her belly
  • Has mammary glands but no nipples
  • Young lap up milk that oozes from openings on their mother’s skin
    • ]]>     2018-04-24 00:47:42 UTC https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254646587     cgdaniel811 https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254646916
  • Young marsupials develop briefly in mother’s body
    • nourished by egg yolk and nutrients  from tissues
  • Born at early developmental stage
    • crawl to permanent pouch on surface of mother’s belly
  • Nipple in pouch supplies milk that sustains continued development
  • Most of 240 modern marsupials live in Australia and nearby islands
    • Kangaroos and koalas are best known
  • Opossums: only marsupials native to North America
    • ]]>     2018-04-24 00:50:31 UTC https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254646916     cgdaniel811 https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254647607
  • Placenta allows maternal and embryonic bloodstreams to transfer materials without mixing
  • Placental embryos grow faster than  other mammals
    • offspring are born more fully developed
  • Young suck milk from nipples on their mother’s surface  
  • Placental mammals tend to outcompete other mammals and are now dominant on all continents except Australia
  • Nearly half are rodents such as rats and mice
    • ]]>     2018-04-24 00:56:08 UTC https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254647607     Summary cgdaniel811 https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254647984 Mammals are endothermic amniotes that have hair or fur. Young are nourished by milk secreted from the female’s mammary glands. Egg-laying monotremes, pouched marsupials, and placental mammals are subgroups. Placental mammals are now the dominant lineage in most regions.]]> 2018-04-24 00:59:11 UTC https://padlet.com/cgdaniel811/9mk6jd6v7ook/wish/254647984