Bolt-bat

Oh, so that's what they look like.

Bolt-bats are a form of wildlife native to both Cybertron and Nebulos. They presumably are easily shocked and amazed by new sights. As well, Sideswipe refers to Cybertronic bolt-bats, implying that there are also bolt-bats native to other planets. S.O.S. Dinobots

It is unknown whether Mindwipe, Sonar, Ratbat, and Nightscream classify as bolt-bats, though Skar definitely is.

Fiction

Beast Wars: Uprising

The ex-Autobot Leatherhide adopted a bolt-bat alternate mode as part of his experiments. Not All Megatrons

Notes

• The AllSpark Almanac II declared Skar to be a Nebulan bolt-bat.