A beautiful video has emerged from Florida, USA of a group of rare manatees passing close to a canoe.<br /><br />In the clip, which was filmed at Weeki Wachee River on April 14, the other-worldly creatures glide past the see-through canoe one after another.<br /><br />Manatees, sometimes known as sea cows, are fully aquatic, mostly herbivorous marine mammals.<br /><br />All three species of manatee are listed by the World Conservation Union as vulnerable to extinction.
