whirligig beetle

US /ˈwɜːrlɪɡɪɡ ˌbiːtl/
UK /ˈwɜːrlɪɡɪɡ ˌbiːtl/
"whirligig beetle" picture
1.

a type of beetle that typically lives on the surface of water, often swimming rapidly in circles

:
The pond was full of tiny whirligig beetles, darting and spinning.
A whirligig beetle can see both above and below the water simultaneously.