Anup Shah / Celebes / Black crested macaque (Macaca nigra) close-up of rears, one female in estrus and one male, Tangkoko National Park, Sulawesi, Indonesia.

Andrew Parkinson / 2020VISION / Young Mallard (Anas platyrhynchos) rears up to shake itself after bathing, Derbyshire, England, UK, June

Miles Barton / David Attenborough observing an Argus monitor lizard (Varanus panoptes rubidus) Western Australia, November 2006, on location for BBC NHU series 'Life in Cold Blood' This species of monitor rears up...

Miles Barton / David Attenborough observing an Argus monitor lizard (Varanus panoptes rubidus) Western Australia, November 2006, on location for BBC NHU series 'Life in Cold Blood' This species of monitor rears up...