Protocairns (Earth-4001)

"Many centuries ago, a group of Matoran decided to grasp for greater power. They exposed themselves to Energized Protodermis and became reptilian creatures called Protocairns."

- Makuta Teridax

Protocairns were arguably one of the most bizarre creatures ever seen on Metru Nui. Resembling raptor-like creatures, Protocairns had two Rhotuka spinners on their bodies which had the capability to temporarily disrupt signals between the mind and body of the target, which would in turn cause them to collapse.

History
The history of the Protocairns is the same as their mainstream counterparts.

Behavior
Protocairns, while bestial in manner, retain sapience and individual personalities. Their Rhotuka spinners can temporarily block the signals between the mind and the body in a target, causing an opponent to collapse.

Every now and then, Protocairns appear on island shores and cause immense destruction, even destroying the shore itself in some cases. Protocairns die soon after this, and their bodies fuse into a landmass. Unwittingly, they help undo their damage by creating more land, which is then built upon. While they live, they are extremely difficult to stop, although the Vahki on Metru Nui have had success at driving them off.

Trivia

 * Parakrekks follow after Protocairns, as they feed off the rubble that the Protocairns create.