Milkweed toxins move from plant to butterfly to butterfly predator (IMAGE)
Caption
This graphic shows how milkweed toxins move from the plant through monarch caterpillars and butterflies into the black-headed grosbeak that feasts on them. To become resistant to the toxins, the grosbeak evolved mutations in its sodium pump (lower left) that are identical to two of the three mutations the monarch itself developed to make it resistant.
Credit
UC Berkeley image by Julie Johnson
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