A Xeme
Sabine's gull (/ˈseɪbɪn/ SAY-bin) (Xema sabini) also known as the fork-tailed gull or xeme, is a small gull. It is the only species placed in the genus Xema. It breeds in colonies on coasts and tundra, laying two or three spotted olive-brown eggs in a ground nest lined with grass. Sabine's gull is pelagic outside the breeding season. It takes a wide variety of mainly animal food, and will eat any suitable small prey.
It is the only animal along with the X-Ray Tetra, in any mods that start with X.