Harmful cyanobacteria blooms (HCBs) are dense concentrations of cyanobacteria (photosynthetic single-celled microscopic organisms) that pose a health risk to people and animals. Cyanobacteria are commonly referred to as blue-green algae because they look very similar to algae. For this same reason, HCBs are commonly referred to as harmful algal blooms or HABs. Learn more here: WyoHCBs.org