Pale pink at first, tree swallow eggs turn white within four days. Learn more about the different types of swallow bird nests ...

Q. I saw a photo of different kinds of bird eggs and noted not only the obvious, that smaller birds lay smaller eggs, but also that some bird eggs are elongate whereas others are more rounded.

D. Russell A bird making a nest. Taryn Elliott The nests and eggs of birds have fascinated us for hundreds of years. At its simplest the nest is any structure made by a bird in which eggs are laid ...