Ключевые слова: biology, bird watching, birder, birding tour, birds, birdwatcher, blue, blue eggs, bowl, breeding, clay, color, color eggs, cup, ecology, egglaying, eggs, forest birds, forest dwellers, hatching, laying, lgbt, natural history, nature, nest, nest saliva, nesting, ornithology, plaster, smear clay, soft blue, song thrush, student learning, turdus philomelos, wildlife, wood dust,