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This is a coloured scanning electron microscope (SEM) image of a brown long-eared bat (Plecotus auritus) foetus. These bats are found throughout the whole of Europe and can be seen roosting in the hollows of woodland trees and in barn roofs. This species typically breeds annually in autumn. Females will only produce a single offspring, although in rare cases some have produced twins. It takes around 60 to 70 days for these bats to develop in the womb before birth. Juvenile bats are born pink, blind and hairless, and will depend on their mother for food and protection for the next 42 days, until they can forage for their own insect prey.