Wood Mouse – Apodemus sylvaticus
Individuals will nest communally in the winter but in the spring females usually take up their own home ranges and nest singly. However, home ranges shared by two females have been observed. Breeding males range over larger areas occupied by a number of females.
Their predators include foxes, weasels, owls and domestic cats. Wood mice are important prey for tawny owls; when numbers of woodland rodents are low, owls may fail to breed.
Studies of woodland seed crops and population numbers organised by the Mammal Society show that the seed crop size strongly influences wood mouse numbers in the same autumn and in the following summer (more food leads to higher numbers and better survival). Numbers are probably synchronised: highs and lows tend to coincide in different parts of Britain, possible because tree seed crops are synchronised.