They are also fairly prolific breeders and are pretty well established in captivity. The perfect 1st lory. I say only partially deserved because all birds are messy. It's just a different type of mess. Seed eating parrots and finches cover the area around their cage with seed hulls and tiny feathers, African greys and cockatoos cause the surrounding furniture to become covered with a fine, white powder.
Mynah birds flick bits of fruit around.
Since lories have a mostly liquid and fruit diet, they consequently have liquid droppings. How much mess they make depends a lot on the individual bird. If you have one that spends a good deal of it's time sitting on a perch, rather than hanging from the side of it's cage, then most of the mess will wind up on the floor of the cage. On the other hand, if it's one that frequents the cage sides, a good deal of the droppings will wind up outside of the cage. A plastic chair mat on the floor is a good start, as well as some kind of washable protection for the walls nearby.