1 year old
it depends
It depends on your parakeet. If the parakeet is a female over about 4 months old, they are capable of laying eggs If it does not have a mate, it usually will not lay any eggs, however its possible. Obviously these eggs will be infertile and will not hatch If she does have a mate, they will lay eggs as long as they have access to a nest box and breeding stimulus (such as extended daylight) It is healthy for a parakeet to lay up to 2 clutches of eggs a year. A clutch is usually 4 eggs. Any more than this and the birds health is endangered. Egg-laying uses up the calcium in the female bird (hen), so you will need to provide her with cuttlebone. Dont attempt breeding your birds unless you have thorougly researched it first. good luck
snakes dont lay eggs
There are three reasons of MAYBE why she hasn't layed any eggs. Reason number one, maybe you haven't been feeding her enough, number two, she's not ready to lay eggs, or number three, this is a little disturbing but maybe it turns out, she's not really a female.
Peahens have been known to lay an egg or two at one year old. But they don't mate til their two years old, so their eggs are only fertile after the mating.
Maybe its too old to lay eggs now or its too cold to lay eggs
When they are about 4-5months old
The caterpillars dont lay the eggs, the female butterfly lays them on the host plant of that species
Yes, hens can lay eggs for 2-3 years.
lay eggs
When they are about 3 years old
After 18 weeks