why do guppies deliver instead of laying eggs ? As I know they r not mammals.?

Answer 1

Some fish carry the eggs inside until they are ready to hatch, some snakes do this too, it is a survival trait. Some fish are good at guarding the eggs, like cichlids, who are quite aggressive. Guppies, mollies ect are not aggressive and if any fish came by their egg piles they wouldn't be able to defend them and the brood would get eaten. It's really neat to watch the live bearers give birth, not only do the babys come out fully developed the egg sacks come out too, along with a few still borns still in the eggs.

Answer 2

Several non-mammalian animals have live young some snakes do it, some fish, some amphibians even do it. there are even two animals that are technically mammals (they have mammary glands) that lay eggs (spiny echidna(sp?) and platypus).

it happens, the fish that deliver live babies (fry) seem to have a higher success rate per amount. they usually only a max of 20 fry with a bigger % making it to adulthood, while egg layers can have 300 or more eggs and a lower % survive.

Answer 3

Guppies, swordtails, and other livebearer fish hatch the eggs inside the female. If you have an opportunity to watch one of these fish giving birth, you can see the remains of the yolk sac on many of the fry.

Answer 4

Some fish are egg layers and others are live bearers. Platys, mollies are some other live bearers. Neons, Catfish, Angel fish are egg layers in fresh water.

Answer 5

Mammals aren't defined by how they deliver their young. All mammals breath air, have hair and feed their young on milk.

Answer 6

because they are a live bearing fish. THe male guppies actually go up along side of the female and will impant it sperm

Answer 7

guppies are live bearers, their babies are born fully formed and swimming - ready to go

Answer 8

I don't know exactly why, but many fish do that.