Why do birds lay only a few eggs?

We show that increased environmental variation causes birds to lay larger clutches. Increased predation pressure experienced by open-nesting birds also causes them to lay smaller clutches than cavity-nesting birds, literally having fewer eggs in one basket to spread the risk.”

Why do butterflies lay many eggs?

The mother butterfly lays eggs in clusters. Behavioural This helps to ensure the survival of some of the eggs at the sacrifice of the rest to parasitoids (parasites that kill the host). The mother butterfly stands guard over its cluster of eggs for days until they hatch.

Which is the only bird which lays more than 100 eggs in one nest?

Surprisingly, the answer to your Q is the Ostrich.

Do butterflies lay a lot of eggs?

Eggs can be laid from spring, summer or fall. This depends on the species of butterfly. Females lay a lot of eggs at once so that at least some of them survive. Butterfly eggs can be very small.

Do birds lay unfertilized eggs?

wild birds will only rarely lay unfertilized eggs, and/or more eggs than they incubate. This is not because breeding triggers ovulation for them, but because it is rather rare to be so short of male birds that they can’t copulate.

Which bird lay only one egg every year?

Laysan albatrosses
It’s no small feat: Laysan albatrosses are monogamous and mate for life, and a breeding albatross lays only one egg per year.

How many eggs can one butterfly lay?

A female butterfly only lays eggs over a 2-5 week period. During this time, she probably lays an average of 300-400 eggs in the wild. Numbers in captivity are higher – about 500-700 depending on things like temperature and the conditions under which the female is kept.

How many eggs do butterflies lay at one time?

A. They only lay one egg at a time, but they can lay many in a single day. (The most I’ve seen is 205 in one day, but this is very unusual.)

Are all bird eggs fertilized?

Birds reproduce by internal fertilization, during which the egg is fertilized inside the female. Like reptiles, birds have cloaca, or a single exit and entrance for sperm, eggs, and waste. The male brings his sperm to the female cloaca. Then the hard-shelled egg develops within the female.