About us: We own the Wild Birds Unlimited nature shop in East Lansing, Michigan,
a store that provides a wide variety of supplies to help you enjoy the birdwatching hobby.

This blog was created to answer frequently asked questions & to share nature stories and photographs.
To contribute, email me at bloubird@gmail.com.

Monday, February 13, 2012

Do birds have belly buttons?

Stages in chick embryo development
All mammals have navels or belly buttons where the umbilical cord distributes nutrients between a mother and her fetus. After birth, the umbilical cord is cut and a scar develops on the abdomen where the hole closes. Humans have very obvious buttons. Other mammals like my cats have teeny, tiny, little, bare patches.

Of course avians or birds hatch from eggs which are virtually self-contained life-support systems that only require warmth and oxygen to develop properly. Instead of an umbilical cord scar, birds have yolk sac scars at hatching. This is where the chick embryo is attached to the yolk sac.

But don’t look for any bird belly button rings. The scars usually heal and become virtually invisible.

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Photo credit:  http://msucares.com/poultry/reproductions/poultry_chicks_embryo.html

2 comments:

Sheds said...

A very interesting post indeed! I never ask that question and it is good to know the information you shared. Good job!

Wild Birds Unlimited Mid-Michigan said...

Thank you for your nice comment. People ask me the most interesting questions. Sarah