Crows recognize human faces and hold grudges for years.
Why it is true
Studies show that crows remember people who threatened them and can teach this distrust to their offspring. They communicate the danger through specific vocalizations, maintaining the alert for several generations.
Source: Science
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.