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A study published in Science Friday found that current concentrations of PCBs could lead to the disappearance of half of the world's killer whale, or orca, populations over the next 30 to 50 years, according to an Aarhus University press release published by ScienceDaily.
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Tahlequah—a southern resident killer whale whose heartbreaking story has captured attention around the world—has been carrying her dead calf for more than two weeks now.
Increasingly, large predators like mountain lions, alligators and killer whales are moving into ecosystems not traditionally associated with them. Mountain lions have been spotted prowling grasslands, alligators have been seen lounging on Florida beaches and killer whales have been spied swimming in freshwater rivers.
Many hypothesized that the animals were taking over new territories as their populations rebounded due to conservation efforts. But research published in Current Biology Monday suggests that they are actually taking back what was rightfully theirs.
Christopher Michel / Flickr / CC BY 2.0
Canada is losing a lot of its wildlife. The World Wildlife Fund's 2017 Living Planet Report Canada found half the monitored mammal, bird, reptile, amphibian and fish species declined from 1970 to 2014. Threatened and endangered species continue to disappear despite federal legislation designed to protect them and help their populations recover. What's going wrong?