Ramon Navarro / Close-up of Little owl (Athene noctua) perched on roof, vocalising, Seville, Spain, July.

Ramon Navarro / Little owl (Athene noctua) vocalising and scratching, Seville, Spain, July.

Terry Whittaker / Two Red-throated divers (Gavia stellata) on a lake, vocalising, Iceland, July.

Andy Rouse / 2020VISION / Wood warbler (Phylloscopus sibilatrix) perched on twig, singing, Wales, UK, June 2012.

John Cancalosi / Male American toad (Bufo americanus) calling to attract female, Ithaca, New York, USA, May.

David Tipling / 2020VISION / Grasshopper warbler (Locustella naevia) singing, Norfolk, England, UK, April

David Tipling / 2020VISION / Reed warbler (Acrocephalus scirpaceus) feeding twelve day old Cuckoo (Cuculus canorus) chick at nest, Norfolk, England, UK, May. Sequene 1/2

David Tipling / 2020VISION / Dunnock (Prunella modularis) singing, Kent, England, UK, April

John Cancalosi / Western diamondback rattlesnake (Crotalus atrox) using rattle as defensive warning, Sonoran Desert, Arizona, USA

Andy Rouse / Little owl (Athene nocuta) perched and vocalising in a Hawthorn tree, Wales, UK, July 2010.

David Tipling / 2020VISION / Nightingale (Luscina megarhynchos) singing in willow (Salix sp), Norfolk, England, UK, May.