The state animal of Connecticut is the sperm whale, as of 2014. The sperm whale was declared the official animal of the state in 1975 by the Connecticut General Assembly.
The sperm whale is the largest of the toothed whales. The sperm whale is an endangered species. It was chosen as the state animal because of the sperm whale's influence in Connecticut's economic history. Connecticut was ranked number two in the 1800s out of all the states in the whaling industry, and the sperm whale was the most desired species of whale at this time. The sperm whale has the largest brain known of any animal that has ever existed.