Sentence:  It's important to put a lot of thought into owning a <WSD>chinchilla</WSD> since they have a considerably long lifespan of 10 to 20 years. / <WSD>Chinchillas</WSD> are most widely known for their exceptional fur coat. 
Meaning of the word marked with <WSD> tags:  Either of two small, crepuscular rodents of the genus "Chinchilla", native to the Andes, prized for their very soft fur and often kept as pets.