Unit 2: BIRD MIGRATION

Unit 2: BIRD MIGRATION (20 Cards)
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1	Aspect	/ˈæspekt/ (n.) a part or feature How birds manage to unerringly travel between distant locations is one aspect that has fascinated observers for centuries.
2	Breed	/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.
3	Diurnal	/daɪˈɜːnəl $ -ˈɜːr-/ (Adj.) active during the day Diurnal migrants have also been shown to use geographic features.
4	Endure	/ɪnˈdjʊə $ ɪnˈdʊr/ (v.) to live under difficult conditions … winter season in nearby valleys, enduring some of the coldest conditions on Earth.
5	Evolve	/ɪˈvɒlv $ ɪˈvɑːlv/ (v.) to develop gradually Scientists believe that birds evolved from dinosaurs.
6	Fascinate	/ˈfæsəneɪt/ (v.) to interest greatly The study of the lives of birds fascinates many people.
7	Feat	/fiːt/ (n.) a difficult act or achievement Modern-day researchers have attempted to understand this feat.
8	Fuel	/ˈfjuːəl/ (v.) to provide energy About 55 percent of bird body weight is made up of the fat necessary to fuel this amazing journey.
9	Hemisphere	/ˈheməsfɪə $ -fɪr/ (n.) one half of the Earth; also, one half of a sphere … migration of this type takes place primarily into the higher latitudes of the Northern Hemisphere.
10	Imperative	/ɪmˈperətɪv/ (n.) a priority; an urgent need Migration is an excellent example of how nature has responded to the biological imperative for species to evolve and spread out
11	Inhabit	/ɪnˈhæbɪt/ (v.) to live in Migration is the regular movement of animals between their breeding grounds and the areas that they inhabit during the rest of the year.
12	Migration	/maɪˈɡreɪʃən/ (n.) movement from one place to another Bird migration generally takes place twice a year. In the spring and autumn.
13	Navigation	/ˌnævəˈɡeɪʃən/ (n.) finding the way from one place to another Birds use the sun, stars, and landforms for navigation.
14	Nocturnal	/nɒkˈtɜːnl $ nɑːkˈtɜːr-/ (Adj.) active at night Nocturnal migrants, those species that travel at night, seem to take their navigational cues from the stars.
15	Obscure	/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.
16	Observer	/əbˈzɜːvə $ -ɜːrvər/ (n.) a person who watches something If birds become aware of the presence of an observer, they quickly fly away.
17	Optimal	/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.
18	Species	/ˈspiːʃiːz/ (n.) type; a basic group in biological classification Migration is an excellent example of how nature has responded to the biological imperative for species to evolve and spread out
19	Stray	/streɪ/ (v.) to leave the correct route; become separated from the group When the stars are obscured by clouds, nocturnal migrants may become confused and return to land or stray off course.
20	Windswept	/ˈwɪndswept/ (Adj.) unprotected from the wind Many rock ptarmigan never leave the high arctic tundra, spending their breeding season atop windswept arctic peak