Semimaru

Semimaru (セミ丸, Semimaru) is an insect animal whose body is located along the southern path of Rainbow Rocks.

Characteristics
Semimaru is an insect whose body is small, round and brown. It has yellow eyes and two transparent wings that go a bit past its body in length.

Hint
Semimaru likes to perch on trees and scream, thus it's very likely it's cries can be heard in an area brimming with trees.

Trivia

 * Semimaru's name is composed of two words; semi (蝉), to mean "cicada" and maru (丸), to mean "round". As such, Semimaru is based on a cicada, an insect well known in many regions of the world, but especially significant in Japanese culture as their loud cries often a sign of summer. Many species spend years in the underground as nymphs, some only to emerge as adults after 13~17 years.