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And the reasons why are hilarious (and adorable).

By Marisa Spyker

If you think back to your school days, you might remember a standard punishment for misbehaving consisting of extra homework or detention. But if you’re a penguin at one aquarium in New Zealand, punishment means having your misdeeds broadcast to the entire world.

In a series of now-viral monthly Facebook posts, the National Aquarium of New Zealand is revealing their worst- and best- behaving penguins in a “Naughty Penguin of the Month” board, with photos of the offender and a description of their behavior.

Exhibit A:

Every month our penguin keepers tell the world about our naughtiest and best behaved penguins! This was the list for June....

Posted by National Aquarium of New Zealand on Saturday, July 1, 2017

Transgressions worthy of the “naughty” wall have included, in the past, stealing fish, being demanding, and “being an egg-hogger and not swimming enough.” This month, a bad-behaving bird named Tux was the target for the unthinkable act of pushing “Timmy off the pier after it took him an hour to walk there.”

Exhibit B:

"News Alert" You have all been waiting! Our Good and Bad Penguins for the month of February👍 Bad Penguin - Tux pushed...

Posted by National Aquarium of New Zealand on Monday, February 5, 2018

Some penguins, it seems, don’t learn from their mistakes. One in particular named Mo is a repeat fish stealer—earning a spot on the naughty list twice for the action—who also hoards nesting material.

But not all penguins are naughty: In addition to the monthly shaming, the aquarium rewards those who commit praise-worthy acts. In a penguin’s world, that means being a good egg incubator or standing up for a penguin who’s being picked on by other birds. And, of course, never, ever, taking a fish that doesn’t belong to you.

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