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Top predator species once nearly extinct makes promising comeback: 'Good to have this species back in the role it's always played'
Otters also help to improve water quality, which is beneficial for river health and the human water supply. "They provide that ecosystem service of being a top predator," Forman added.
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'It's a dolphin!': Researchers uncover unusual ancient fossil in the Amazon
There’s the South Asian river dolphin (Platanista genus) and the Amazon river dolphin (Inia ... ‘river dolphins’ can be considered as apex predators,” Velez-Juarbe said.