Baby mantis shrimp start punching early

This 29 April 2021 video says about itself:

Watch a baby mantis shrimp punch in slow motion | Science News

A larval mantis shrimp (Gonodactylaceus falcatus) — filmed at 2,000 frames per second and played back at 3 percent speed — retracts and locks its attack arm to store energy before releasing a strike. New research shows these larvae begin unleashing their punches by the time they are 9 days old.

Read more here.