Every spring Swallows arrive in Britain and the rest of Europe having journeyed from southern Africa across the equatorial rainforest, the Sahara Desert and the Mediterranean. They spend the summer living off insects caught on the wing close to the ground and over rivers and lakes. They breed in mud nests built under the eaves of houses. In the autumn they gather in flocks to return once more to southern Africa. Their annual return journey is around 12000 miles and can be considered a feat of endurance for such a small bird.
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