Animal Birth methods placental or otherwise

  Terry Brown 29 Mar 13
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Answered

In a science class (Biology) we got to talking about birth methods of animals and mammals. (YES- 65, retired and back to college)

Some (like humans) have a umbilical cord which needs to be cut (or severed) and sealed and others do not.

Is there any way of defining which group animals and mammals belong to, in regards to this method of birth and apart from being 'In the wild', where no facilities exist, are there any advantages / disadvantages?.

Terry

  Fruit Bat /\0/\ 29 Mar 13

Animals are divided into various sub-groups, including birds, mammals, reptiles, fish and insects.

As far as I am aware ALL mammals have umbilical cords.

  onthelimit1 29 Mar 13
Answer
  john bunyan 29 Mar 13

From memory, Mammals (with a few exceptions) have live, "umbilical" births and suckle their young and are warm bloodied and mostly hairy.. A few mammals are egg layers - Echidnas, Duck billed platypus to name two - I assume they do not have umbilical chords..

  Terry Brown 30 Mar 13

Onthelimit 1

Thanks for a very good answer, The question we was asked was:-

"Do all warm blooded animals/mammals have an umbilical used for nurturing the young and what happened to it after birth., if not name some of that do not and the reasons why not?

Thanks also to John Bunyan and Fruit Bat?/\0/\

And this is only the basics!!.

Terry

  Belatucadrus 31 Mar 13

I suspect the question is referring to Marsupials and Monotremes. Both technically mammals, but neither develops their young in vitro via a placenta.

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