David Bellamy and TV presenter Kate Humble led this year's panel of judges in the Zoological Society of London (ZSL) Photography Prize.
The panel picked two overall winners in the adult and junior categories, from more than 1,000 entries.
Bence Mate's A Giant Trophy for a Small Ant won the overall adult award, while Connie Beith's Knotted was the overall winner in the junior section.
The winning photographs are currently on show at an exhibition at London Zoo.
The competition, now in its second year, encourages amateur and professional photographers to get out and capture the magic of the natural world.
Individual winners - both adult and junior - were also selected in each of the seven categories.
Each individual adult winner is awarded £1,000, with an an additional £1,000 for the overall winner; in the junior section, individual winners scoop £250, with an additional £500 for the overall winner.
"After the calibre of the entries into the ZSL Animal Photography Prize in 2012 we had high hopes for this year's competition, but we couldn't have anticipated the incredible quality of the images entered," said Sarah Barron, who manages the exhibition.
Individual categories such as Last Chance to See focused on threatened species and endangered habitats, Deep and Meaningful looked at aquatic animals, while Catch Me If You Can encouraged photographers to take pictures on the move.
"The category names are designed to encourage photographers to think more profoundly about the natural world and the winning images truly reflect this aim; each photo provokes curiosity and wonder about the animal kingdom," added Ms Barron.