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Swallows have adapted to hunting insects on the wing by developing a slender streamlined body, and long pointed wings, which allows great manoeuvrability and endurance.They have short bills, but strong jaws and a wide gape. The wings are long, pointed, and have nine primary feathers.The tail has 12 feathers and may be deeply forked. A long tail increases manoeuvrability,the tail is frequently longer in males. Female Barn Swallows will select mates on the basis of tail length.The legs are short, and their feet are designed for perching rather than walking, as the front toes are partially joined at the base, causing the bird to display a waddling gait.