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Dolphins: Facts about the intelligent marine mammals that use tools to hunt

Despite their name, killer whales (orcas) are actually dolphins.
The Virginian-Pilot

Endangered pink river dolphins face a rising mercury threat in the Amazon

PUERTO NARINO, Colombia (AP) — A flash of pink breaks the muddy surface of the Amazon River as scientists and veterinarians, waist-deep in the warm current, patiently work a mesh net around a pod of ...