Pesticides, hunting, water pollution and others factors led to their demise.
NPR: Native American Symbols: Eagle, Bison Reclaimed
These factors include high water temperatures, pollution, sedimentation, high light levels, reduced water levels and changes in salinity.
CNN: Warmer tropical waters portend climate change
Sun exposure and indoor pollution from burning solid fuels are also risk factors.
BBC: Latin America 'threatened by rising cancer cases'
But other contributing factors to their include coastal development, egg poaching, ocean pollution and global warming.
CNN: Turtles in race to beat extinction
The changes could not be explained by other factors - such as mother's age and socioeconomic status or population effects such as changes in air pollution and influenza epidemics.
BBC: Smoking ban 'cuts premature births'
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