The genus Rynchops, which are commonly known as skimmers, are tern-like birds in the family Laridae of the order Charadriiformes.
Some authorities place the genus Runchops in a separate family Rynchopidae (Ho Xuc Ca).
The genus name Rynchops is from the Ancient Greek rhunkhos meaning "bill" and kopto meaning "to cut off".

1/ Indian skimmer or Indian scissors-bill (Xúc cá, Rynchops albicollis)