I mentioned yesterday that there were only 5 species of squirrels in Costa Rica. When most people think of mammals in Costa Rica, they think of monkeys, sloths, jaguars, olingos, coatis, and other exotic tropical animals, not squirrels.
As rodents, squirrels are members of the most prolific type of mammals. 43% of the 4,050 known species of mammals are rodents, and there are more rodents alive than all other mammals combined. There are rodents on all continents except Antarctica and Australia.
Unlike some other mammals, male squirrels are not territorial. They will forage for food in the same area that other squirrels seek food. Squirrels are also not particularly territorial when it comes to mating. According to my Costa Rican wildlife book, 4 or more males will chase a female for several hours until the female selects her mate. Sounds like a bad scene from a sports bar.