Beaker

From the Super Mario Wiki

Beakers are tiny, green creatures (vaguely resembling apes) from Wario's Woods. They are the rarest enemies, along with Scrams; they also happen to be identical to Scrams in that they can only be destroyed by diagonal bomb chains. It is interesting to note that a Beaker would appear to have two faces on both sides of his body, one of which is two large, blank eyes, the other being a saddened face; Beakers constantly rotate to show off these faces.

[edit] Trivia

• The word "beaker" actually means "a cup or flask". Beaker's relation to these real-life beakers is unknown.