sentence: Many birds are territorial, especially in the nesting season.
sentences_before: Many birds are not camouflaged but stand out with vivid colours. They are usually male birds whose females are dull and camouflaged. They function of the colours is two-fold. Adaptive colouration in animals'. First, the colours help them get mates, and second, the colours identify them to other males of the same species.
sentences_after: They give out territory sounds and are easily seen. This lets other males know they will defend their territory.
concept_name: bird
headings: Bird Bird colours Noticeable colours
categories: Basic English 850 words