My boy Finn bites bars to his cage also. I move him to his sun room or his sun cage near the window so he can enjoy the sun, then I put him back to his cage when the sun goes down.
Lara Doesn’t bite the bars of her cage. The only time I see her biting bars is when I sit next to her feeding her snacks. She hides when she is put near the window for viewing the sun but she still does what Finn does. She is never left out of activities Finn enjoys doing.
Lara has many dolls nearly her size and she drags her dolls around her cage and sometimes puts them in her hidy to sleep together. Both Finn and Lara have different favorite toys and different activities they enjoy.