I think puzzle feeders is a great idea! I've been trying to get some rat puzzle feeders 3d printed because theres a huge variety for those guys in about the right size range. I've also seen people make tire swings and cocohut swings for them. Other things I've seen are artificial boxwood-style climbing walls, little mirrors, and seesaws.
Coenobita Curiosities on etsy sells little mesh foraging cubes, and Happy Crabby has the busy ball which is a similar concept. Both are like Kong dog toys but for crabs lol.
I saw one person using sisal rope wound around suspension curtain rods as a way to hang different things in a crabitat. You could use this to hang swings or rat foraging toys!
I change up and use novel food dishes (in new locations) when I can, which keeps the tank cleaner and keeps the crabs entertained.
I had a sturdy little glass bottle I hadn't used for anything, I filled it with fish oil and then tied cotton gauze over the top and left it in the crabitat overnight. They went crazy for it! I found shreds of the gauze all over and the little bottle itself had been buried the next morning. DIY can keep things interesting on a budget...
I found inspiration from zoos and reptile keepers!
https://zoosnippets.com/post/environmen ... -checklist
I hope this helps! This has been my thought project all week so I was so happy to see someone else looking for ideas
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