Nick Garbutt / Acacia sp. at night, with a herd of Plains Zebra (Equus quagga) beneath. Near Ndutu, Nogorongoro Conservation Area, Serengeti National Park, Tanzania.

Diane McAllister / Newly hatched Western scrub jay chicks (Aphelocoma californica) huddling together in their nest near one last egg. This nest is in a backyard in Reno. Nevada, USA, June

Yva Momatiuk & John Eastcott / Sugar Maple (Acer saccharum) leaf, close up of groups of cells turning red in autumn, Hudson River Valley, New York

Yva Momatiuk & John Eastcott / Sugar Maple (Acer saccharum) leaves, close up of groups of cells changing color in autumn, Hurley, New York