Sentence:  <WSD>Spiny rats</WSD>, "Proechimys semispinosus", are rodents weighing up to 500 g which eat fruits and seeds that have fallen to the forest floor. In Lutz catchment, a <WSD>spiny rat's</WSD> territory is three-fifths as wide as an agouti's (Smythe et al. 1982). 
Meaning of the word marked with <WSD> tags:  Any of certain caviomorph rodents of the family Echimyidae, especially of genus "Proechimys", that resemble rats and have stiff, pointed hairs, or spines.