When I got Lincoln he came with a cage and all his toys. Problem is, the toys look REALLY old. Like they're super faded in color (they look like they were once brightly colored) and I've been hesitant to replace them with newer toys because I don't want to stress him by taking away everything familiar and replacing it with new, scary things. I did replace one toy a week ago though. He was really scared of it at first and would do everything in his power to avoid going close to it. He eventually started moving around it but still not really playing with it. (It's a foraging toy with strips of paper and twine, I hid some sunflower seeds in it for him to find) Today he did start tearing at it though which is a good sign, but it took a week for this to happen. I was thinking of just slowly replacing all the toys one by one like I did the other but I mainly just want to know if boredom can lead to aggression because when I'm keeping him preoccupied he's very sweet and will occasionally let me pet him, but when he isn't doing much he gets a bit nippy.