Which term describes the wryneck's camouflage adaptation for blending against complex backgrounds?

Cryptic appearance achieved through heavy mottling, streaking, and barring.

The wryneck's plumage functions as a masterful form of cryptic coloration, which is its primary defense mechanism when stationary. This camouflage is achieved through intricate patterning rather than bright signaling colors. The feathers are heavily mottled, streaked, and barred across the browns, greys, and buff tones. This intricate visual texture serves to effectively break up the bird’s outline, making it incredibly difficult for predators to distinguish the bird from complex, textured backgrounds such as rough tree bark, patches of mossy wood, or irregular patterns in the leaf litter. This mastery of disguise is so effective that the bird can remain unnoticed even when in plain sight.