Ottawa River WatershedThe Ottawa River is home to many different ecosystems, each playing an important role in sustaining Canada’s biodiversity. More than 300 species of bird have been inventoried along the river. Of these, about half are migratory species that use the Ottawa River region as one of the continent’s most important migratory halts. Along the river, 33 species of reptiles and amphibians, 53 species of mammals, and 85 species of fish can also be observed. Among these, several are rare or at risk.