Haematococcus
Algae
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Haematococcus is a genus of algae in the family Haematococcaceae. Members of this group are a common cause of the pink color found in birdbaths. Wikipedia
Higher classification: Haematococcaceae
Scientific name: Haematococcus
Genus: Haematococcus; Wille in Warming, 1884
Order: Chlamydomonadales