Ibis?

As well as the white egrets of various shapes and sizes--I haven't yet been able to distinguish baby big egrets from small adult egrets -- there are large wading birds that look black from a distance. They are not herons: I think they are ibis. Glossy Ibis are often seen on Long Island. I saw three fly past one day, long curving beaks leading the way. The only photos I've managed so far show them as black long-necked dots next to white long-necked dots. Will keep trying.

Ibis reminds me of Isis; Egypt and Bob Dylan.