Some unique nests of birds

The nest mounds built by Dusky Scrubfowls are the largest nest in the animal kingdom. They usually measure more than 11 m or 36 ft in diameter and stand nearly 5 m or 16 ft tall.

 Hummingbird

The smallest bird nests are those of some Hummingbirds, tiny cups which are 2 cm across and 3 cm high. The beautiful Hummingbird nest with two chicks on the above photo was photographed in Santa Monica, California, USA.