Bears
Now, many people might find this one shocking. Given their enormous size, inherent hunting prowess, and extremely keen claws and teeth, it is more than obvious that the bear could easily kill and swallow a groundhog.
Although bears do enjoy fish, most people would assume that they would chase something larger. Despite all of that, bear attacks on groundhogs may be incredibly severe and occasionally just plain distressing to witness. A groundhog's death can be among the most horrifying due to a bear attack.
Bears are known to stalk their prey, making it difficult for an animal like the groundhog to flee from such a strong predator if it is unaware of the impending attack. In contrast to the others stated, he will find it much more difficult to remain undetected.
The bear will leap in and clamp down on the groundhog's neck like a firm vice grasp if he can follow the groundhog to a weak point undetected. It can also hit an animal and possibly shatter its back with its large, strong paws. On occasion, the bear will simply attack the groundhog. Sadly, the chances of a bear assault are in the bear's favor given that a groundhog is smaller than a huge bear.