Vertebrates that eat nectar include hummingbirds and some bats. Hummingbirds have an ability to hover at a flower, and a long tong that they can stick deep into the flower to lap up nectar. Bats that drink nectar at night seek flowers by their smell. Then they hover at the flowers, and use their tongues to lick up nectar.
The main function is to break down lactose in the body. when you are lactose intolerant (which most adults are to a degree) then tactasr is no longer funtioning properly and lactose isnt being broken down
