I'm thinking of getting my Senegal a couple of foraging toys for in and out of his cage. Was wondering if the plastic/metal ones are safe if left in his cage, or should I only put one on his stand where I can watch him with it? Have a few wood/grass ones that are ment to be destroyed also in mind. Since he likes to chew things I'd like some that I could re-use, but only if they'd be safe for him. Thanks.