Teach your young learners about the wonderful world of whales with our free, downloadable, five-day unit, with lessons, ...

Male polar bears can weigh up to 700 kilograms (1,540 pounds) and reach lengths of over three metres (10 feet). This makes them the largest land predators in the world, outmatching even grizzly bears.

icy waters of the Arctic. The sea sponges survive by feeding on the remains of worms and other extinct animals that perished thousands of years ago, they suggest. Sponges are very simple ancient ...