Animal of the week
A herd of walruses recently overran a small Alaskan village, and scientists have no idea why. Residents of Port Heiden spot the marine mammals in the water occasionally, but were surprised to discover more than 1,000 of them basking on the beach.
LIFESPAN IN THE WILD: Up to 40 years.
HABITAT: Shallow ice-shelf areas, sandy beaches and rocky shores in parts of the Arctic and sub-Arctic.
DIET: Despite their size, these large animals feed on small invertebrates such as clams, shrimps and octopus.
FUN FACT: Walrus are famous for their tusks, which are in fact canine teeth that can grow up to a metre long.