This is the best tl;dr I could make, original reduced by 72%. (I'm a bot)

> Canadian researchers have discovered high levels of a "Forever chemical", used in making toilet paper, in the bodies of endangered killer whales, sparking fears the toxic substance could further harm them.

> Because killer whales, or orcas, sit atop the food chain, they often ingest smaller organisms tainted with the chemical - a phenomenon known as biomagnification, making orcas among the most contaminated cetaceans in the world.

> Experts nonetheless worry high concentrations of 4NP, similar to those found in the studied whales, can interact with the nervous system and influence cognitive function as well as affect hormone levels and make the whales more susceptible to illness.

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