The American woodcock, sometimes colloquially referred to as the timberdoodle, mudbat, bogsucker, night partridge, or Labrador twister is a small shorebird species found primarily in the eastern half of North America. Woodcocks spend most of their time on the ground in brushy, young-forest habitats, where the birds' brown, black, and gray plumage provides excellent camouflage.
American woodcock
Woodcock, with attenuate primaries, natural size, 1891
Downy young are already well-camouflaged.
In zoology, a crepuscular animal is one that is active primarily during the twilight period, being matutinal, vespertine/vespertinal, or both. This is distinguished from diurnal and nocturnal behavior, where an animal is active during the hours of daylight and of darkness, respectively. Some crepuscular animals may also be active by moonlight or during an overcast day. Matutinal animals are active only before sunrise, and vespertine only after sunset.
A red fox at dusk
A domestic cat at low light
Fireflies at twilight, long exposure
Ocelots are active at night, especially during dawn and dusk.