migration - movement of animals or humans from one place to another, population - the people who live in a country, or the total number of animals in a region, decline - decrease, habitat - natural home of a plant or animal, climate - general weather conditions, trigger - cause, pattern - repeated or regular way in which something is done, endangered - may soon disappear, extinct - does not exist any more, species - a related group of plants or animals, colony - group, function - purpose, role, mechanism - device, method, predatory - killing and eating other animals, herbivore - organism that eats only plants, average - typical, theory - an idea or set of ideas that tries to explain something, trait - characteristic, research - study, contribute (to) - help,

TOEFL Vocabulary: Animal Behavior

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