Warp Bat

The upper caverns of the Under-Empire are home to hundreds of different species of bats. But these are not all of the bats that dwell in the lightless world of these endless tunnels. One breed lives deep, far below even Hell Pit, and they feast on Warpstone, hence their name: Warp Bats. Skaven miners are always watchful for these creatures, as their presence is a good indication that a lode of Warpstone is nearby.

Warp Bats are similar in appearance to normal bats, although their fur is pale and their bodies are bloated, distorted by constant exposure to Warpstone. Due to their increased size, which can occasionally rival that of a horse, Warp Bats are unable to fly. Instead they move by crawling quickly across the ground and walls of their underground domain. Like other bats, they use a series of high-pitched shrieks and chirps to create a sort of sonar, allowing them to navigate in total darkness.

Source

 * Warhammer Fantasy RPG 2nd ED -- Children of the Horned Rat
 * pg. 117

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