What causes extremely high levels of toxic chemicals in fish-eating birds?

Name: What causes extremely high levels of toxic chemicals in fish-eating birds?
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Biological magnification, also known as biomagnification, is the process where toxins become more concentrated in organisms as we move up the food chain. Since birds at the top of the food chain commonly eat fish, they accumulate higher levels of toxic chemicals, such as mercury or PCBs, that are often found in fish.

What Causes Extremely High Levels of Toxic Chemicals in Fish-Eating