Polar Bears
Top 2 in Top 10 World's Most Solitary Animals
The largest terrestrial carnivore on the planet, polar bears spend most of their time around bodies of water and ice. The polar bear enjoys having a rather isolated existence. Adult polar bears are often not very sociable, save from actively pursuing mates in the late spring and early summer and caring for their offspring.
This can be seen when the mating process is taking place. Once they've met their mate, these bears are only together for approximately a week before they separate, and the male may then seek out another mate. Males locate females by tracking their smell.