I presently have two diamond doves that I've had for perhaps a little less than a year, as well as two brand new (as in still being QT'd) zebra finches. Both have spacious cages with flying/perching room, a nest, some various nest material dispensers (suet feeders stuffed with shredded paper, sm animal hay balls filled with timothy hay and the finches have an additional toy that dispenses sissal threads), and foraging mats. But I still feel like their environments are... well... kindof boring. I'm used to coming up with creative foraging for my parrots, but I'm at something of a loss with these little guys. I know they aren't big chewers or climbers like birds, but do they like bells? Preening toys? Do they like checking out novel objects? Would they nibble on pet grass? Are there any other good ways to mimic natural behaviors or otherwise entertain them? Input appreciated.