This vest is several years old, so I can't direct you to it, but I've seen many others out there that are similar with lots of pattern variations. (whenthegirlsrule.com)
«We have demonstrated that due to natural colour pattern variation, a fish only learns to recognise the consistent parts of the colour pattern that the Gonibranchus splendidus nudibranch displays, and not the parts of its pattern that change.» (sciencedaily.com)
Plasma Aβ1 — 40 levels showed a saw - tooth pattern variation associated with PE. (content.iospress.com)