Insect; a member of the class Insecta — typically six-legged arthropods. A more scientific term than 虫.
昆虫の観察が好きです。
I like observing insects.
夏になると庭にいろいろな昆虫が現れる。
Various insects appear in the garden in summer.
昆虫は生態系で重要な役割を果たす。
Insects play an important role in the ecosystem.