Over Christmas I converted my tiels medium sized sleeping cage into a flight cage. I was under the impression bigger is always better. She still hates it... refuses to go in it when she used to always hang out in her open cage throughout the day as part of her climbing around (she'd climb in and out and all over) and would put herself away to sleep at night. Now I have to bribe her with millet. I gave her a month to get used to it, tried many different set ups and levels of fullness in terms of toys and perches and gave up and gave her her old cage back... she's currently in it grinding her beak. Odd bird