Ha! It's not that strange. Horses are mammals. =D
One could also say that the bears is a neighborhood football team, for example. I decided to enjoy the quirky sentences, once I realized that the literal meanings of the sentences are not important. I believe their objective is to teach different words to you, even if these word happen to be together in a nonsense sentence (gramatically correct, but unlikely). All of this is done to increase your general vocabulary so that you can put together your own sentences correctly later. =)
That reminds me of a country song with a lyric "Whiskey for my men and beer for my horses." I think the country song lyric is even a bit stranger. I mean think about it: we're always told not to drink and drive, but the men in the song are potentially getting their MODE OF TRANSPORTATION drunk! :-P
Toby Keith featuring Willie Nelson. "And we ride into battle to fight evil forces singing/ whiskey for my men, beer for my horses"
I wonder where the bears got beer though - probably swiped it from some campers :-P
All mammals drink milk when they are very young - horses are no exception.
Because "Horses" is plural, its "The horses drink." If it was singular, only talking about one horse, then it would become "Drinks" , "The horse drinks."
There is no plural when describing the action of drinking, unless you are talking about one horse - ''the horse drinks''. 'The horses drinks' wouldn't work in English either.