Last Sunday's grebe trio of Red-necked,Horned and Pied-billed was a first occurring on the same day for Prospect Park.
Looking at recs I printed from Cornell Ebird and comparing years showed no match for Rednecked and Horned in any particular year. Due to that no match, Pied billed being more common was a moot question.
Amazing historical prospect moment for us grebeophiles. 🤗