Jack Dykinga / Scalding hot water continuously spouting behind layers of mineral deposits, Fly Geyser, Black Rock Desert, Great Basin Desert, Nevada, USA

Mark Taylor / Black and white Jack-a-poo, Jack Russell cross Poodle, pup, 8 weeks old, jumping up.

Alex Mustard / Group of predators hunting together, in an example of 'Nuclear foraging'. The Moray eel (Gymnothorax javanicus) flushes out prey, and is followed by a Napolean wrasse (Cheilinus undulatus) and a Bluef...

Markus Varesvuo / Jack snipe (Lymnocryptes minimus), Uto, Finland, November.

Jack Dykinga / Scalding hot water continuously spouting behind layers of mineral deposits, Fly Geyser, Black Rock Desert, Great Basin Desert, Nevada, USA

Mark Taylor / Smooth coated Jack Russell Terrier puppy, black and white, 9 weeks, sitting, looking up

Jane Burton / Rough coated Jack Russell Terrier puppy, black and tan, portrait

Jane Burton / Rough coated Jack Russell Terrier puppy, black, tan and white, portrait

Jane Burton / Smooth coated Jack Russell Terrier, black, tan and white, female with two 8 week puppies

Jack Dykinga / Mount McKinley and Black Spruce trees (Picea mariana) viewed from Wonder Lake, Denali National Park, Alaska

David Kjaer / Black tailed jack rabbit {Lepus californicus} Arizona, USA

Rolf Nussbaumer / Black tailed jackrabbit drinking {Lepus californicus} Texas, USA.