Red-clawed Crayfish Cherax quadricarinatus

The Red-clawed or Red Claw Crayfish, also called the Australian and the Queensland Red-clawed Crayfish and sometimes the Blue-claw or Blue Crayfish, is a tropical, freshwater crayfish native to rivers and lakes of northwest Queensland and Northern Territory, Australia. It may also be native to part of Papua New Guinea. It has been introduced to other tropical areas of the world.

A large crayfish, growing to 20cm long, adults have a deep blue or blue-green/green-brown shell, large red eyes and four longways ridges on the head. Adult males have a bright red edge to their large claws.

It is an omnivorous predator and scavenger. It spends much of its time hiding in crevices, especially after moulting when it is most vulnerable.