Sentence:  Many <WSD>ground squirrels</WSD> sit up and look like prairie dogs, but a ground squirrel can be recognized by its longer face and tall. 
Meaning of the word marked with <WSD> tags:  Any of a number of medium-sized squirrel-like borrowing rodents of the tribe Marmotini (i.e., excluding the smaller chipmunks and the larger marmots and prairie dogs).