Thala-siren

Thala-sirens were large pink-colored flippered marine creatures that were found lying on the cliffs of the sacred temple island on Ahch-To, the site of the first Jedi temple, when Rey traveled to the island to find Jedi Master Luke Skywalker.

While Rey followed him around the island, Luke went up to one of the three nearby resting creatures and filled up a bottle with its green milk before drinking it.

Appearances

 * Star Wars: Episode VIII The Last Jedi