The European nightjar (Caprimulgus europaeus) is a nocturnal bird that nests directly on the ground amongst fallen pine needles and leaf litter. Both male and female nightjars have highly cryptic, variegated grey-brown plumage that resembles dead wood or tree bark.
Explain how this variegated grey-brown plumage increases the survival rate of the nightjar, particularly during the daytime when it remains motionless on its ground nest.
