When breeding, the juveniles and adolescents can feed from trough. For babies, use a maewing or hand feed raw meat into their inventory. Confirmed today the juveniles feed from trough which contradicts several wikis.
It really is that simple though, they can't reach you or your flier on a big enough rock, so if you don't want to make a trap you can just shoot down from a rock or cliff once the carnos are dealt with. Be ready for a goose chase once it starts running.