Steven David Miller / Sulphur-crested cockatoo (Cacatua galerita) feeding on seedpods in Flax wattle (Acacia linifolia) tree. Lane Cove National Park, Sydney, New South Wales, Australia.

MYN / John Tiddy / Acacia Horned Treehopper (Sextius virescens) on wattle(Acacia pycnantha), Victoria, Australia, October. meetyourneighbours.net project

Ernie Janes / Domestic Norfolk grey chicken (Galllus gallus domesticus) male head portrait, UK, March.

MYN / John Tiddy / Golden Wattle (Acacia pycnantha) close up in flower, Victoria, Australia, August. meetyourneighbours.net project

Nick Garbutt / Male Ward's flycatcher (Pseudobias wardi). Mantadia NP, Madagascar.

Jane Burton / Domestic chicken, White leghorn cockerel crowing.

Joel Sartore / Photo Ark / Wattle-necked softshell turtle (Palea steindachneri) head portrait, Turtle Island, Austria. Captive, occurs in southern Asia. Endangered.

Joel Sartore / Photo Ark / Tenggara hill mynas (Gracula venerata) looking around, Prigen Conservation Breeding Ark, Java, Indonesia. Endangered. Controlled conditions.

Joel Sartore / Photo Ark / Tenggara hill myna (Gracula venerata) vocalising. In the background, another Myna is looking. Prigen Conservation Breeding Ark, Java, Indonesia. Endangered. Controlled conditions.

Joel Sartore / Photo Ark / Nias hill myna (Gracula robusta) looking around with its beak open, before hopping forward, Prigen Conservation Breeding Ark, Java, Indonesia. Critically endangered. Controlled conditions.

Suzi Eszterhas / Two Wattled cranes (Bugeranus carunculatus) feeding in grassland, Jao Reserve, Botswana.

Joel Sartore / Photo Ark / Wattled guan (Aburria aburri) head portrait, National Aviary of Colombia. Captive, occurs in South America.