Bert Willaert / Composite image of American fish species introduced to Europe: Pumpkinseed sunfish (Lepomis gibbosus, left), Brown bullhead (Ameiurus nebulosus, right) and Eastern mudminnow (Umbra pygmaea, under), ph...

Jan Hamrsky / Great Diving Beetle (Dytiscus marginalis) larva feeding on small fish. Czech Republic. Controlled conditions.

Stephen Dalton / Domestic cat (Felis catus) watching House mouse (Mus musculus) appear from under furniture, UK, controlled conditions

Stephen Dalton / Barn owl (Tyto alba) in flight, flying down to catch rat prey, UK, manipulated image (controlled conditions rat protected by sheet of perspex)

Stephen Dalton / Green cat snake (Boiga cyanea) striking, a rear-fanged arboreal rainforest species, controlled conditions, from India and SE Asia

Stephen Dalton / Green cat snake (Boiga cyanea) defensive behaviour, a rear-fanged arboreal rainforest species, controlled conditions, from India and SE Asia

Barry Mansell / Short-tailed snake (Stilosoma extenuatum) Hernando Co. Florida, USA, Threatened species. Controlled conditions

Barry Mansell / Cuban treefrog (Osteopilus septentrionalis) Lake Kissimmee, South Florida, USA. Introduced into the USA from the West Indies. Controlled conditions

Daniel Heuclin / Pyrenean desman (Galemys pyrenaicus pyrenaicus) Pyrenees, France, Controlled conditions. vulnerable species

Daniel Heuclin / Pyrenean desman (Galemys pyrenaicus pyrenaicus) Pyrenees, France, Controlled conditions. vulnerable species

Daniel Heuclin / Mediterranean Gecko (Hemidactylus turcicus) on a wooden plank. Controlled conditions. Florida Keys (introduced species), USA, November.

Daniel Heuclin / Philippine bluntheaded tree snake (Boiga philippina) coiled round tree branch, Luzon, Philippines, Endemic Species, January, Controlled conditions

Daniel Heuclin / Philippine bluntheaded tree snake (Boiga philippina) moving through the air, between trees. Luzon, Philippines, Endemic Species, January, Controlled conditions

Daniel Heuclin / Three Asp vipers (Vipera aspis) on red earth, each a different colour morph. France, Europe. Controlled conditions.

Daniel Heuclin / European whipsnake (Hierophis / Coluber viridiflavus) attacking an approaching Red fox (Vulpes vulpes) Poitou, France, Europe. Controlled conditions.

Stephen Dalton / Hume's bar tailed pheasant (Syrmaticus humiae) on grass, Endangered species, controlled conditions

Stephen Dalton / African grey parrot (Psittacus erithacus) feeding on piece of lychee fruit, controlled conditions, Endangered species

Stephen Dalton / American mink (Mustela vison) controlled conditions, UK, introduced species