Charlie Summers / Star trails above Colorado. USA, April.

Michael Quinton / Common Loon (Gavia immer) chick with hatching egg in nest in the summer, Wyoming

Michael Quinton / Great Gray Owl (Strix nebulosa) brooding female with chick in nest cavity at top of snag in the summer, Idaho

Alan Murphy / Eastern Screech Owl (Megascops asio) chicks peering out of nest box, Texas

Tim Fitzharris / Pied-billed Grebe (Podilymbus podiceps) parent on floating nest with chicks, New Mexico

Thomas Mangelsen / Sandhill Crane (Grus canadensis) chick, Gray's Lake, Idaho

Tui De Roy / White Tern (Gygis alba) chick clinging to bare branch nest, Midway Atoll, Hawaii

Norbert Wu / Laysan Albatross (Phoebastria immutabilis) fledgling chick, Hawaiian Islands National Wildlife Refuge, Hawaii

Michael Quinton / Common Raven (Corvus corax) group dead lying on the ground beneath their nest, perhaps pecked to death and tossed out by aggressive young Common Ravens seeking to claim the territory, Idaho

Michael Quinton / Common Raven (Corvus corax) parent feeding its week old chicks in their nest, Idaho

Michael Quinton / Common Raven (Corvus corax) parent feeding its week old chicks in their nest, Idaho

Flip Nicklin / Masked Booby (Sula dactylatra) with two chicks, Hawaiian Leeward Islands

Tui De Roy / Laysan Albatross (Phoebastria immutabilis) parents guarding young chick, Midway Atoll, Hawaii