These birds have very short legs which they use only for clinging to vertical surfaces ( hence the German name Mauersegler, literally meaning " wall-glider ").
These birds have very short legs which they use only for clinging to vertical surfaces.
These birds have very short legs which they use only for clinging to vertical surfaces.
These birds have very short legs which they use only for clinging to vertical surfaces.
These birds have very short legs which they use only mainly for clinging to vertical surfaces.
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