![]() ![]() In fact, one of the most interesting things about manatees is that they keep replacing their teeth as long as they live. It is possible that the colors blue and green may be beneficial to enhance contrast and determine what might be edible in the manatees’ underwater world.Ī. Most other marine mammals have monochromatic vision. This characteristic is similar to that of California sea lions, fur seals, elephants, and hyraxes. Manatees are believed to have dichromatic color vision. Behavioral research has confirmed that they are able to see the colors blue and green against a grey background but are unable to see red. Based on the internal structure of the manatee eye, which possesses rods and cones, manatees have color vision. It’s safe to say that manatees do not rely on their vision as their primary sensory system, however they may utilize eyesight in combination with other senses to perceive their world in a way that benefits them beyond what we presently know.Ī. As manatees evolved, they have adapted to live in murky waters and rely on more than one type of sensory system to investigate their underwater world. Manatees rely on direct contact for closer inspection, rather than on sight, which can be problematic if they encounter objects such as monofilament fishing line, discarded fishing gear, and other trash. It is believed that manatees have rather poor visual acuity at close distance but better than expected visual acuity at medium or long distance. Manatees have fairly good visual acuity and can distinguish between different-sized objects, brightness, and patterns. They do not have eyelashes but rather open and close their eyes like the iris of a camera. Manatees’ eyes are small and they have a nictitating membrane that can be drawn across the eyeball for protection. Learn more about estimating manatee age using growth layer groups in ear bones.Ī. Living manatees are classified as calves, subadults, and adults and age can be approximated by birth date (if known) and their size. A manatee’s age can be determined by the annual growth rings in its ear bones. How can the age of a manatee be determined?Ī. Q: Do manatees have ears, and where are they located? (Click the link above to get the video answer.) They typically have about three to four fingernails on each flipper. Only West African and West Indian manatees have fingernails.
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