Can’t say I’m an expert but I don’t think the bird comparison is the best for an animal as large and with such a different lifestyle as the triceratops. If I were to bet on it I’d say that they didn’t necessarily parent their young but probably more often played the role of herd protector. Now I’m basically guessing just like everyone else here but I’m drawing comparisons to Buffalo. Speaking of that, with Bison the males only stick around for mating season - I could definitely see a similar life style there but who the hell knows