Crossbeaks need to be trimmed down when they get too long, they don't naturally wear down. There will be a kind of translucent part, that is the part to trim. The solid part is the part that will bleed.
The crossbeak is probably growing slower because it's harder to eat; not impossible but harder because they have to scoop (deeper dishes work best)
The crossbeak is probably growing slower because it's harder to eat; not impossible but harder because they have to scoop (deeper dishes work best)