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.

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

Notes

• Transformers Animated: The AllSpark Almanac Volume 2 declared Skar to be a Nebulan bolt-bat.