The Open Door Web Site
Facts and Figures Index
FACTS AND FIGURES
The otter's diet includes frogs, crayfish, crabs and fish which are caught and eaten immediately. Otters are energetic animals and need to eat frequently. The sea-otter is unusual because it uses a tool to help it break open clam shells. The sea-otter floats on its back with a flat stone lying on its chest. It holds the clam with its front paws and strikes the clam on the stone until the shell breaks. This can take between 2 and 22 tries.
When the sea-otter finds a stone with the correct shape it may use it more than 20 times to break open clam shells.
The otter has webbing between its toes to help it swim under water.
Locusts, Bristol Zoo, UK
A locust is a herbivore. Many millions of locusts travel together in a swarm. When a swarm of locusts arrives in a region of Africa the sky turns black. There are so many locusts that they stop the light from reaching the ground. There can be as many as 40 million locusts in a swarm. They can travel 3500 kilometres in one month.
The swarm does not travel at night because it is too cold. About two or three hours after sunrise, when the temperature reaches between 25°C and 30°C, the swarm takes to the air.
The locusts can fly up to 8 hours before they come to rest on an area of vegetation. They then eat until sunset. Each locust eats 2 grammes of vegetation each day. in a single day the swarm can eat 80,000 tonnes of vegetation. If the swarm comes to rest on a field of crops, it can eat enough food to feed 400,000 people for one year.
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