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The breeding and wintering grounds of the American redstart, Setophaga ruticilla.
This portrait of Thomas Jefferson is considered an accurate likeness, painted when he was thirty-sev
Suicide rates in Canada are more than three times higher for males than for females
Mosaic X Chromosome Expression in Human Females
Gypsy moths native to Europe and Asia feed on oaks through much of the United States.
Nutrias native to South America are abundant in freshwater marshes of the Gulf States. Their populat