motacilla alba disguised as stone and motacilla alba lugens singing

adaptability behavior blending breeding camouflage chirping communication conditions conservation contrasting creatures development disguised ecological egglaying energetic environment environmental expressive feathers fledging flocking foraging grasslands greenery hatching highpitched inconspicuous insectivorous instincts landscape melodious migrates migration migratory motacilla movement nurturing offering patterns perched perfectly pollution predation predators protection remains rhythmically riverbank seasonal sedentary showcases singing solitary strategies surroundings survival temperate temperature territorial territory twitches undefined variations vigilance vocalization vocalizes wagtails wetlands