John Chan / Two male Southern Pacific rattlesnakes (Crotalus oreganus helleri) fighting during mating season. This behaviour is known as a "combat dance", and is used to determine dominance and the right to mate...

SCOTLAND: The Big Picture / Orange jewel anemones (Corynactis viridis) Sula Sgeir, Scotland, UK, February.

SCOTLAND: The Big Picture / Close up of a colony of Jewel anemones (Corynactis viridis) Scotland, UK, October.

Brian Bevan / Male Green woodpecker (Picus viridis) feeding young at nest hole, shot looking up trunk, Bedfordshire, England, UK, June.

Brian Bevan / Juvenile Green woodpecker (Picus viridis) leaving nest hole, shot looking up trunk, Bedfordshire, England, UK, June.

Brian Bevan / Male Green woodpecker (Picus viridis) feeding young at nest hole, shot looking up trunk, Bedfordshire, England, UK, June.

Graeme Guy/ BIA / Blue-throated Bee-eater (Merops viridis) pair, Penang, Malaysia

Piotr Naskrecki / African Paradise-Flycatcher (Terpsiphone viridis) flying, Gorongosa National Park, Mozambique

Silke Arndt / Western rattlesnake (Crotalus viridis viridis), threat display, South Dakota, USA, September.

Ingo Arndt / Prairie rattlesnake (Crotalus viridis viridis), threat display, South Dakota, USA September. Sequence 1 of 3

Ingo Arndt / Prairie Rattlesnake (Crotalus viridis viridis) in defensive posture, South Dakota

Graeme Guy / Blue-throated Bee-eater (Merops viridis) pair, Penang, Malaysia