Update, had a couple of bad spellings.

It’s the time of year when birds build their nests. There are different types of nests, but one thing that they have in common is some form of hiding them. The parents try to protect the babies from predators. 
I’ll start with traditional nests.

By, MeegsC, Wikipedia Commons

By, Wikinoby, Wikipedia Commons

By, Robert Lawton, Wikipedia Commons

By, Conty, Wikipedia Commons

This nest could be a natural hole in the tree  by, Dario Sanchez, Wikipedia Commons

This dug out nest is in the side of a cliff  by, Bruce, Wikipedia Commons

By, MeegsC, Wikipedia Commons

The eggs hatch on the ground  by, Vereena Gill, USGS

Osprey nest  by, Tibor Duliskovich