Lakitu in a Pipe
From the Super Mario Wiki
Lakitu in a Pipe is, aptly enough, a Lakitu that inhabits a Warp Pipe and throws Spiny Eggs at Mario or Luigi. Exclusive to Super Mario World, they have green eyes rather than the red ones possessed by their cloud-riding counterparts. A simple stomp to the head takes them down.
It is possible to see their entire body by attacking them with a cape (which causes them to fly out of the pipe) or pulling them out of the pipe with Yoshi's tongue. They look identical to other Lakitus.