Least Bittern
- Describes size, coloring, habitat, diet, migration, reasons for decline, and how to help protect this threatened wading bird.
- http://www.ct.gov/dep/cwp/view.asp?q=326030

American Bittern
- Provides description, habitat, diet, breeding and wintering ranges, reasons for decline, and how to help.
- http://www.ct.gov/dep/cwp/view.asp?q=325954

Yellow Bittern
- Tells about where this wader lives, what it eats, how it sounds and looks, how many can be found in Singapore, and if they are threatened.
- http://www.naturia.per.sg/buloh/birds/Ixobrychus_sinensis.htm

Bitterns
- Learn about this relative of the heron and egret; where they live, how they are different, what they look like, and if they are threatened.
- http://www.naturia.per.sg/buloh/birds/Botaurinae.htm