That is a terrifying puppet. Like wtf is it supposed to be?

I'm kinda surprised to see them training them one at a time. That's going to take ages. "OK, Roger has been successfully intimidated by the nightmare puppet. Looks like Brenda is next in line, someone bring in Brenda."

Marine biologist’s friend: How’s work been lately?

Biologist: Great! This month I’ve been putting on puppet shows for crabs!

Friend: Is that a euphemism or …?

Pretty sure crabs brains are so simple that they are almost purely instinctual. You shouldn't need to train them. But I can hurt, I guess.

Making crabs even more appealing is that they’re native to Florida, just in relatively low numbers. (“Everything eats them,” Spadaro said.) Adding them to the reef is unlikely to have any grave unintended consequences for the ecosystem, Spadaro said, especially considering that there are few other herbivores.

Yeah

Crabs eating to save the environment isn't gonna destroy the environment

Biodiversity is more important.

Also you're talking about microalgae, the stuff that makes water look green. The stuff the crabs would be eating is growing on the coral or is shading it like kelp.

Or copy Roosevelt’s idea and use badgers.