Which animals lay eggs and can give birth to young ones?

Question

Which animals lay eggs and can give birth to young ones?

Answer 1

Snakes and sharks have members that give birth to live young and lay eggs.

Answer 2

Both?

I have heard that one species of Thrips can.  But I'm not convinced yet.

Answer 3

None.

Answer 4

there is no found animal on this planet who can both lay eggs as well as produce young ones. best wishes.

Answer 5

WHEN YOU FIND THIS ANIMMAL TELL ME

Answer 6

There is no single species which does both, but there are types of animals in which some species lay eggs and some give birth. Snakes are a good example. Some snakes, for example pythons and cobras, lay eggs, whilst others, such as boas and rattlesnakes, give birth to live young.

Andrew G is mistaken about seahorses - males do not swallow the eggs! The female lays her eggs in a brood pouch on the male's belly, where he fertilizes them and keeps them until they hatch.

Answer 7

Aphids and scales (and some thrips) go through cyclical parthenogenesis, meaning one generation mates and lays eggs and the rest reproduce through parthenogenesis (giving birth to live daughters, which are basically complete genetic copies of the mother). Eventually, one of the parthenogenetic generations will give birth so some males and the egg-laying cycle will start again. Usually they travel to a new area for this. The system is a little different for different species, but that's the basic idea.

Also, as Andrew said, there are other animals that do both in the sense that the eggs incubate in the body first then the live young are born (though they are not born in the same sense that mammals are born). However, if you are looking for animals that lay eggs outside their body and also "give birth" (even in the sense of the eggs incubating inside first) I don't believe seahorses and snakes are good examples since both do not occur within the same species as it does with aphids and scales.

Answer 8

Snakes can do both; but those snakes that give rise to live births (I think the garter snake of the USA is one type) actually are egg-laying. like all other reptiles; but they incubate the eggs inside their bodies before the young are 'born'.

Male seahorses  (a type of fish) do the same; the males keep the eggs in a brood pouch, and incubate the eggs inside their bodies, before 'giving birth' to live seahorse babies.

Some insects can give birth by two ways:the  usual sexual reproduction, or parthenogenesis, which is female birth without fertilisation; but I think eggs are still laid in such cases.

(edited the seahorse bit, which had an error).