Members range in size from 12.5 to 23 cm (5 to 9 inches) long. They have thin, pointed bills, pointed wings, and elongated hind toes and claws. These trim birds walk and run rapidly (but never hop). They seek out insects along the ground. Their flight is strongly undulating, like that of many finches (finch). The pipits proper (Anthus), so called because of their twittering sounds, are brownish streaked. Wagtails (wagtail) (Motacilla), which continually pump their long tails up and down, are more boldly marked. Both groups have white outer tail feathers, which show best in flight.