Halcyon is a genus of the tree kingfishers, near passerine birds in the subfamily Halcyoninae.

1/ Black-capped kingfisher (Sả đầu đen, Halcyon pileata) 
2/  White-throated kingfisher (Sả đầu nâu, Halcyon smyrnensis)
3/ Ruddy kingfisher (Sả hung, Halcyon coromanda)
4/ Collared kingfisher(Sả khoang cổ, Todiramphus chloris), also white-collared kingfisher, black-masked kingfisher or mangrove kingfisher