Male fireflies, known for attracting mates with a flash of light, also seduce with a gift, say scientists.
This gifts comes in the form of a spermatophore: a package containing sperm and nourishment for the female.
Researchers from Tufts University in Boston, US, found that females preferred males that had the largest, most nourishing gift.
The team presented their findings at the First Joint Congress on Evolutionary Biology in Ottawa, Canada.
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