VOA慢速英语:Intelligent Crows Use Tools

extinct – adj. no longer existing

crevice – n. a narrow opening or crack in a hard surface

beak – n. the hard usually pointed parts that cover a bird’s mouth

exceedingly – adv. very

specific – adj. special

prior – adj. before

vast – adj. very great in size or amount

spontaneously – adv. done or said in a natural and often sudden way