Guinea pigs, or cavies as they are also known, have been kept in households as companion animals since being introduced by European traders in the 16th century.
Crepuscular animals are most active during twilight, meaning dawn and dusk. Some will also be awake at other times too, though it depends on their needs.
Living this way helps animals to avoid extreme temperatures, to evade predators and, sometimes, to take advantage of high prey availability.
Find out more about the crepuscular animals in our A-Z archives by clicking the photos below.
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In the wild hamsters spend most of their time digging and searching for food.
Female kangaroos can determine the sex of their offspring. They can even delay gestation when environmental factors are likely to diminish the chance of young surviving.
The world’s smallest mammal. Tiny and mysterious, we need to know more about these rare flying mammals if we are to prevent their extinction.
A male moose has a ‘dewlap’, a dangling flap under the chin. The size and shape of the dewlap may indicate dominance level. Males also use the dewlap to scent mark females by rubbing it against them during the mating season.
When threatened ostriches run although their powerful, long legs can be formidable weapons, capable of killing a human or a potential predator like a lion with a forward kick.
Reindeer, or Caribou as they are known in North America, are a deer species adapted to cold Arctic conditions.