Spiracle

[Sarah]

The nostril, or one of the nostrils, of whales, porpoises, andallied animals.

[Ernesto]

in an insect or spider , one of the small holes that allow air in and out through the surface of the body

[Kai]

An external respiratory opening, especially each of a number of pores on the body of an insect, or each of a pair of vestigial gill slits behind the eye of a cartilaginous fish.