migratory – adj. relating to birds, fish or other animals that migrate

species – n. a group of living organisms made up of similar individuals

principle – n. a basic idea or rule that explains how something happens or works

virtually – adv. almost

come to light – phr. make or become widely known

net – adj. an amount left over after all costs have been taken away

diverse – adj. including many different kinds

consistent – adj. always behaving in a similar way

incredibly – adv. extremely

respond – v. say or react to something in reply