1. Incubation
2. Nestlings
3. Fledglings
4. Courtship
5. Mating
Now, let's see what are they
1. Incubation (Hard Egg)
Birds begin their life inside a hard egg. The parent Bird will sit on the eggs to keep them warm until they hatch. The embryo gets nutrition from the yolk which is the yellow part of egg, which contains high fat and protein, so the embryo can stay alive inside the egg.
2. Nestlings
Nestling breaks through the shell using tiny chisel. When the Birds hatch, they’re called nestlings. The parent Bird will bring the food so they can grow.
3. Fledglings
At about 7 days old, it starts to grow its adult feathers. Birds leave their parents and the nest at the end of this stage.
4. Courtship
Courtship varieties between different Birds and happens during migration for Birds that migrate. Birds court one another with dances, songs and building nests. Most of the time, females build it because the male looking for a food.
5. Mating
After the nest is completed, the couple mates and the female lay eggs to begin life cycle again. The male bird attracts the female by singing and doing tail dancing. Some of birds are doing polygamy which is the male mate with more than one female, and some other birds also do polyandry which is the female mate to more than one male.
That's all :) Hope it's able to add more knowledge. Thanks
Sources:
http://www.Budgierisa.
webs.com/lifecycle.html
http://wiki.answers.com /Q/How_do_birds_mate
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