SpiderBot

SpiderBots are one of Cybertron's many examples of fauna. More of a pest than anything, these small, three-legged scavengers have no defenses to speak of, and are so fragile they practically explode when touched. Needless to say, neither the Autobots nor the Decepticons consider them a threat, and will usually ignore them. They're known to bunch up when alarmed. They can also walk on ceilings.

Transformers: War for Cybertron
The Aerialbots sighted a number of SpiderBots as they moved through Trypticon's interior.

Transformers: Fall of Cybertron
They were common in the Sea of Rust, and Cliffjumper and Jazz encountered them occasionally while infiltrating Shockwave's base.