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Unit 2: BIRD MIGRATION
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1. Optimal
/briːd/ (v.) to reproduce Migration is the regular movement of animals between their breeding grounds and the areas that they inhabit during the rest of the year.
/ˌnævəˈɡeɪʃən/ (n.) finding the way from one place to another Birds use the sun, stars, and landforms for navigation.
/ˈɒptəməl $ ˈɑːp-/ (Adj.) best, most favorable This form of migration allows birds to breed in areas that provide optimal conditions for nesting and feeding their young.
/əbˈskjʊə $ -ˈskjʊr/ (v.) to make difficult to see When the stars are obscured by clouds, nocturnal migrants may become confused and return to land or stray off course.
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