3. Red squirrels like to look after their teeth by gnawing on pieces of dead deer antler, which are full of calcium.
4. Scotland used to be so covered with trees that it is said that a red squirrel could have journeyed from its West to East coast without touching the ground. Male red squirrels each hold territories about the size of 34 football pitches.
5. Study the patterns left on a nibbled pinecone to discover whether it's been eaten by a left or right-handed squirrel. Left-handed squirrels hold the cone with the top towards the left and use the left hand to rotate the cone, and right-handed squirrels do the opposite.
12. Fungi may be taken to the drey to dry out, and, because red squirrels don't hibernate, they bury other leftover food in holes or crevices to be eaten when food is scarce.
13. Red squirrels can jump more than 2m and survive a fall of more than 12m without injury.