it’s obvious, it’s clear
(lit. – it’s clear to a hedgehog)
Comments / examples:
This praseologism was given to us by Mayakovsky in 1925, who wrote the folowing lines:
Я́сно да́же и ежу́ — Э́тот Пе́тя был буржу́й.
It's clear even to a hedgehog - This Petya was a bourgeois.