Hoppers, the common variety of Beetleworx, and as their name implies, they hop around the levels on patrol for everyone's favorite mouse. Most of these Beetleworx are modeled after various birds, such as the vultures from The Jungle Book or the Vultures from Snow White, which can be found in Ventureland and Lonesome Manor respectively, and Scuttle from The Little Mermaid or Wilbur the Albatross from The Rescuers, the latter variety being found on Mickeyjunk Mountain. There is also a variety found in Tomorrow City, having space helmets, but no one is sure what variety it is.
In the sequel, some new types of Hoppers appear. In Bog Easy, they're based on either Friend Owl from Bambi or the owl from The Old Mill. In the Train Tunnels, there's the toy soldier from "It's A Small World " varieties, the small horned devils from Mr. Toad's Wild Ride in the Floatyard, and in the credits an unused blue bird.
Hoppers peck at Mickey if he gets too close, causing him to losing a life. In order to defeat Hoppers, do not use Paint, because beetleworx do not have emotions, thus rendering Paint unable to redeem them. Instead, you have to defeat these enemies with Thinner. They have an iron shell made from Paint, which can be melted with Thinner, like all Beetleworx. When you have done this, use Mickey's Spin Move right on their green glowing points and they will be defeated. Hitting this will defeat them. Another way to defeat the Hoppers is to use your Spin Move repeatedly and push them aside to Thinner pools or off cliffs.
Paint cannot defeat them, but it can slow them down temporarily. If you're low on health, or you just want to avoid the fight, use this method to your advantage.
In the second game, they're shown to have buzz-saws implanted into their heads.