Each of the RotTMNT turtles are a different species, which means they all have different diets. So I find it absolutely hilarious to think that maybe they would just, start eating things that aren't normal without realizing it.
Ornate Box Turtles diet is mostly fruits and vegetables, with insects for protein.
When they where younger, Splinter would have to burrito-wrap Mikey to keep him from eating any bug he saw, and he had to find a non-toxic bug spray just to stop him for good. Now Mikey secretly goes to pet stores to buy crickets, which he grinds up and makes into cookies, that he eats...And feeds to his brothers when he's mad at them.
When Donnie found out about him feeding them bug-cookies, programed the oven to burst into flames whenever a bug entered the kitchen so that Mikey couldn't make them anymore bug-cookies. It didn't work, because he just went to Aprils, and because she though it was hilarious, she let him use her oven.
Leo, because he is kind of gross, still eats the cookies willingly and give Mikey feed-back. Donnie didn't talk to him for a week when he found out.
When Alligator Snapping Turtles are young, their diet is primarily made up of small fish, crustaceans, and insects.
Splinter would regularly catch baby Raph, and a baby Mikey, catching cockroaches, sliverfish, and, at one point, a live garden snake. Raph had grabbed the snake by both ends and started relentlessly chewing its middle. He hadn't managed to break its skin before Splinter took it from him, called pest control, and left it in a box by the manhole. Baby Leo considered himself a connoisseur because he only ate ants.
Raph eventually grew out of it, but he still occasionally gets a craving for cockroaches.
Spiny Softshells eat a lot of small fish, crayfish, and aquatic insects.
When Donnie was younger, he tried to eat bugs like Raph and Mikey, but he ended up hating the texture and how they wiggled, much to Splinter's relief, two bug-eating babies was enough. He did, however, eat any random fish they found drifting in the sewers, and tried to eat old sushi from the trash. He also repeatedly ate Splinter's goldfish if he saw them.
Now, Mikey makes him sushi regularly, and was horrified to find that Donnie likes sardines on pizza. Donnie hides it because he knows Leo would use it to prove the pineapple is a better topping.
Red Eared Sliders eat a mostly vegetable diet, with bugs for protein, much like Ornate Box Turtles.
Leo has been caught, on several occasions, in the middle of the night eating every food and veggie in the fridge like a rabid dog. Donnie was extremely sleep-deprived, and believed he was hallucinating, so he told nobody, in fear of losing his coffee rights. Raph thought that he was imagining it, and was afraid of what Mikey would say about his mental state if he told anyone. Mikey, the only one who hadn't witnessed it yet, theorized that Donnie was stealing the vegetables for experiments.
After Donnie and Raph individually both spent several years believing that they were experiencing random, time specific hallucinations, Mikey finally stumbled upon one of Leo's veggie-binges, and screamed. Raph and Donnie both rushed in, only to find that neither of them were hallucinating, and Leo was just too stubborn to eat vegetables, because they were for 'nerds', and had resorted to this.
Raph smack him on the head, Donnie threatened him, and Mikey forced his to eat at least one fruit or vegetable a day, and attend weekly 'salad parties' (something he made up on the spot) with him, since they were the two who's diets required the most veggies.
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