As long as humans have been sailing the seas, cats have been by their side.
A US Navy officer pets a boat cat.
Ancient Egyptian tomb paintings dating back 5,000 years show cats hunting birds from a boat, Christenson told Insider.
The Phoenicians and the Vikings, both master seafaring communities, later helped spread cats throughout Europe.
British, French, and Spanish explorers in the late fifteenth century carried cats to the Americas upon the discovery of the "new world" during the age of exploration.