Other reasons included a severe climate, and loss of living space and water to farm animals.

VOA: special.2010.06.22

High levels of domoic acid in the sardines may have worsened the effects of oxygen loss in the water as the fish crowded into a limited space.

VOA: special.2011.03.15

They also help prevent soil loss and protect water supplies.

VOA: special.2009.09.01