Scientists watched as bats consistently landed only on the flowers that still had their hidden pollen keels intact, while avoiding the depleted ones. There were so many flowers—how did the bats find the right ones? A small concave appendage flanks the unopened flowers, like an extra petal on a hinge; researchers found that this acts as a perfect mirror for the bats’ sonar. The echo it sent back from multiple angles was of “astonishingly high amplitude,” they wrote, much like the echo from the leaves on the Marcgravia. Once the flower had disgorged its pollen on a bat butt, the mirror would
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