hi...your young bun is frightened by the cat toy. I have the same plastic orbs with the bells inside, when my bun was about that age he lunged at EVERYTHING you put in front of him, he'd even attack the stick vac I dust the floor with. It's typical & typically they lunge at it because it's "foreign" to them...rabbits are "prey" animals & they have "knee jerk" reactions to alot of things...they're also very particular about their environment; just as you have to acclimatize a toddler to a new toy, you have to do that with your new bun...they don't always like the toy or the lunging is that they see it as an INVASION of their space...it's this foreign object which is in it's environment. If you find your new bun persistently has this reaction to that toy, then remove it & try something else...he or she doesn't like it. With my bun Bizz, he hates the cat toy...he doesn't like most toys, he's annoyed by anything put in his space...The only way I could play with him is to place various things in front of him [from a toilet paper tube, to a woven straw carrot made from edible grass]...no matter what play toy I taunted him with he'd lunge at it or just nip at it & hurl it [throw it out of the way]. Some rabbits this is play behaviour, others it's aggravation...but I'm confident if the rabbit likes the toy then they'd approach it, but if the toy is in the room & they never bother with it then lunge it, show aggression toward it when it's put near them, then they're totally ANNOYED by it. Hope this helps...