Screech rhino

The screech rhino was a very large alien mammal that can typically weigh 3,000 tons.

In 2371, when Jadzia Dax was manipulating the USS Defiant (2370)'s communications holo-filter, so that Benjamin Sisko would look like a Kobheerian to an approaching Cardassian ship, she said, she could also make his com image look like a 3,000-ton screech rhino, if he so desired. 

Rhinozeros