Penguins can drink salt water.
Why it is true
They have a supraorbital gland that filters excess salt from the blood, which is expelled through the beak.
Source: Marine Biology
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.