Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 11 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered. (non-ex)

Morley Read / Developing embryo of the Ecuadorian monkey frog (Phyllomedusa ecuatoriana), showing heart beating and blood flowing, Morona Santiago Province, Ecuador, (non-ex)

Willem Kolvoort / Water filled ditch with shadow of a tree on water with Fringed waterlily (Nymphoides peltata) Star duckweed (Lemna trisulca) Netherlands. July 2015. Commended in the Underwater World Category of the G...

Neil Aldridge / Leopard (Panthera pardus) female resting on the branch of a tree in the heart of Chief's Island, Okavango Delta, Botswana. Vulnerable species. The leopard is classified as vulnerable by the IUCN and i...

Neil Aldridge / Leopard (Panthera pardus) cub peering out from thick vegetation in the heart of Chief's Island, Okavango Delta. Botswana

Neil Aldridge / Angolan reed frog (Hyperolius parallelus) resting on a reed stem in the heart of the Okavango Delta, northern Botswana.

Andres M. Dominguez / Heart shaped lip dactylorhiza orchid (Orchis cordigera) in flower, Sierra de Grazalema Natural Park, southern Spain, May.

Danny Green / Japanese crane (Grus japonensis) displaying, wings in heart shape, Hokkaido, Japan, February

Ole Jorgen Liodden / Heartsease / Wild pansy (Viola tricolor) flower, Norway, May.

Lynn M Stone / English Springer Spaniel in Virginia Cowslip (Lamprocapnos spectabilis) Rockton, Illinois, USA

Cyril Ruoso / Greater Flamingo (Phoenicopterus ruber) pair, principally native to the Caribbean region and Galapagos Islands, Ecuador

Inaki Relanzon / Whitsunday Islands, aerial view, Great Barrier Coral Reef, Queensland, Australia, October 2011.