The three-toed sloth is the slowest mammal on Earth, due to its lack of muscle tissue.It is so sedentary that algae grows on its furry coat. All sloths are built for life in the treetops. Three-toed sloths also have an advantage that few other mammals possess: They have extra neck vertebrae that allows them to turn their heads some 270 degrees.
The Dwarf Syngnathidas swims at about 0.01 mph, making it the slowest fish in the world. They are found in shallow tropical and temperate waters throughout the world. Unlike most other fish, they are monogamous and mate for life. Rarer still, they are among the only animal species on Earth in which the male bears the unborn young.