You need to be more specific as to the type of bird. Also, are you referring to eggs laid at once (in a "clutch") or over the lifespan of the bird?
The typical number of eggs that a bird will lay varies considerably from species to species. Though, for practical reasons, birds cannot lay more than about 20 eggs at once - whereas reptiles (the other main hard-shell egg-laying group) can lay multiple dozens of eggs at a time.
yes. One at a time!
All birds lay eggs. There are no exceptions.
Seagulls (there are many species) are birds and lay eggs.
yes birds lay eggs
all birds lay eggs.
Yes, they are birds and birds lay eggs.
Yes All birds lay eggs
2-3 eggs.
Many birds lay only 1 at a time but the majority lay around 3-7.
Yes. Herons are birds, and all female adult birds lay eggs.
They lay eggs
birds lay eggs
amphibians lay eggs, and positively birds lay eggs.