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Mammals have a belly button which is the remainder of their attachment to the umbilical chord but do birds reptiles fish etc. have a remainder of their attachment to the yolk sack?
BenWingfield
" All placental mammals will have a "belly button" as this is the remainder of the umbilical cord when they were attached to their mother in the womb. It's difficult to see due to mammals having fur or hair.
Also...If you think of it....birds and reptiles that come from eggs will have some "form" of a "belly button" as when they are in the egg they are attached to the "yolk sac" via a cord.
Maybe you can't see this clearly due to scales and feathers..but I bet if we looked closely enough..you'd find "something" I bags NOT to be the person who wrestles with a croc to find out if reptiles have one!!!"
audry o's answer to http://answers.Yahoo.com/question/index?qid=20080325032221AAcFeEk
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∙ 14y ago
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Can a reptile be a mammal?
Yes, reptiles are NOT mammals. Reptiles are exothermic vertebrates (coldblooded), have no fur, lay eggs and do not lactate. Mammals are endothermic vertebrates (warmblooded), have fur/hair, give birth to live young and lactate.
Are alligator's mammals?
No, alligators are not mammals, they are reptiles.
What do you call mammals with umbilical cords?
They are placental mammals.
Are snakes mammals or animals Not reptiles?
Snakes are reptiles. Both mammals and reptiles are animals.
Are rabbits reptiles?
No,they are mammals. No. Rabbits are mammals, not reptiles. Another Rabbits are in the rodent family. Reptiles are snakes, lizards etc.
Why are mammals closey related to reptiles?
Mammals are not closely related to reptiles
What are mammals and reptiles?
Mammals are warm blooded and reptiles are cold blooded.
Does a squid have a placenta and an umbilical cord?
No, only mammals have a placenta with umbilical chord.
What was the physical changes from reptiles to mammals?
The physical changes from reptiles to mammals are there skin. Reptiles have dry scaly skin and mammals have smooth skin.
Which reptiles are mammal?
No reptiles are mammals.
What is the same about mammals and reptiles?
Something that is the same about mammals and reptiles are that they are both alive. Diferent: reptiles r cold blooded!
Do all animals have umbilical cords?
Not only humans have umbilical cord, all the mammals of the Eutheria infraclass have it, this are the placental mammals and are all the animals that give birth to a live animal but not including the marsupials such as the kangaroo, for example the human, the dog, the cow all have umbilical cord
