5th box -Flashcards

/əbˈzɜːvə $ -ɜːrvər/ (n.) a person who watches something If birds become aware of the presence of an observer, they quickly fly away.

/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.

/ˈwɪndswept/ (Adj.) unprotected from the wind Many rock ptarmigan never leave the high arctic tundra, spending their breeding season atop windswept arctic peak

/fiːt/ (n.) a difficult act or achievement Modern-day researchers have attempted to understand this feat.