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Birds, most reptiles, many fish and almost all amphibians lay eggs and have a backbone. In addition, there are the monotremes, or egg-laying mammals, which include the platypus and the echidna.
Wiki User
∙ 12y ago
Wiki User
∙ 14y agoAll mammals have a backbone, but the only mammals which lay eggs are the group known as monotremes. This group includes just three species: platypus, short-beaked echidna and long-beaked echidna.
Wiki User
∙ 12y agoAll mammals have a backbone. Therefore, the two mammals which lay eggs both have backbones.
The platypus and the echidna are the only two egg-laying mammals in existence.
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∙ 11y agoweiner
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Do camels lay eggs?
No, a camel is a mammal.
Does a monotreme mammal lay eggs?
Yes. Monotremes are mammals which lay eggs.
Do rabbitts lay eggs?
no they do not lay eggs the have baby's like any other mammal!
Does zebras lay eggs?
no, it's a mammal
Does a yak lay eggs?
No. A yak is a mammal.
Do lambs lay eggs?
No Lamb is a mammal. Mammals do not lay egg.
What do most animals hatch from?
If a mammal is pregnant, a mammal will give a live birth. Now birds and other animals of that kind, will lay eggs. The only mammal to lay eggs is a platypus.
How do shrews keep their eggs warm?
A shrew is a mammal, and does not lay eggs!
Does a platopus lay eggs?
yes it is the only mammal that lays eggs.
Do fossas lay eggs?
Fossas are a type of Madagascan mammal. Apart from monotremes, mammals do not lay eggs.
How many eggs do cheater lay at once?
The cheater is a mammal, they do not lay eggs but give birth to live young.
Does a narwhale lay eggs?
No. A narwhal is a mammal, gives live birth, suckles their young, and doesn't lay eggs.
