From Longman Dictionary of Contemporary Englishgroundhogground‧hog /ˈɡraʊndhɒɡ $ -hɑːɡ, -hɒːɡ/ noun [countable] 
HBAa small North American animal that has thick brown fur
HBAa small North American animal that has thick brown furExamples from the Corpus
groundhog• In Maine, people gauge whether spring has arrived not by groundhogs, but by skunks.• At least the blood congealing on the asphalt proved that his groundhog was freshly killed.• Well, no groundhog will see the top of the ground today, nor any shadow if it did.• The Super Bowl champions have been crowned -- no fatalities this year -- and the groundhog has seen his shadow.• It will be weeks before the groundhog comes up.• What Intel does tomorrow is going to be like the groundhog.• Never mind what the groundhog says; this means spring has arrived. 