Ole Jorgen Liodden / Magnificent frigatebird (Fregata magnificens) male with gular pouch, Galapagos.

John Cancalosi / Grey tree frog (Hyla versicolor) calling to attract mate, New York, USA

Claudio Contreras / Yellow tree frog (Dendropsophus microcephalus) calling on plant stem, Montes Azules Biosphere Reserve, Lacandon Rainforest, Mexico, August

John Cancalosi / American toad (Bufo americanus) male calling to attract female, New York, USA

John Cancalosi / American toad (Bufo americanus) male calling to attract female, New York, USA

Nick Garbutt / Male Anole Lizards (Anolis sp) in territorial display to each other. Rainforest canopy, Rio Claro Reserve, Magdalena Valley, Colombia, South America.

B&S Draker / Mexican Burrowing Toad (Rhinophrynus dorsalis) adult bloated as defense. Starr County, Rio Grande Valley, Texas, USA.

Nick Garbutt / Black Vulture (Coragyps atratus) standing on a dead bloated Yacare Caiman (Caiman yacare) floating down the Cuiaba River, Northern Pantanal, Matto Grosso State, Brazil. September

Piper Mackay / Black vulture (Coragyps atratus) standing on dead, bloated Caiman (Cayman jacare) in Three Brothers river, Pantanal, Brazil

Piper Mackay / Black vulture (Coragyps atratus) standing on dead, bloated Caiman (Cayman jacare) in Three Brothers river, Pantanal, Brazil

Piper Mackay / Black vulture (Coragyps atratus) standing on dead, bloated Caiman (Cayman jacare) in Three Brothers river, Pantanal, Brazil

Anup Shah / Nile crocodile {crocodylus niloticus} in shallow river water beside bloated dead Wildebeest in dry season, Serengeti NP, Tanzania