Squirrels are well known to most of us, and are easily recognised. They can be quite prolific in their reproduction, with two breeding seasons per year. After a gestation period of 6.5 weeks (45 days), the first litter is born in late February or early March. A typical litter contains 3 or 4 young. If a second litter is born, it usually occurs at the end of June or into July.

The young are weaned at about 10 weeks old, and leave the nest soon after.

The squirrel nest is known as a drey, and is made of twigs and leaves, and can sometimes be lined with grass. When dreys are made in roof spaces, the squirrels will gather all manner of fabrics, gnawed cardboard etc. to act as nesting materials.

Squirrels have a surprisingly wide and varied diet, eating foods such as fruits, nuts seeds, plant and tree buds, fungi, and new shoots. They will also take birds' eggs and even the nestlings. Obviously, bird food etc. put out in gardens becomes an easy target, but because many people like squirrels, the food is put out specifically for them.