Bumblebees Bite Leaves of Flowerless Plants to Stimulate Earlier Flowering, Biology

A team of researchers from ETH Zürich and the Universite Paris-Saclay made observations suggesting that bumblebees have strategies to cope with irregular seasonal flowering: when faced with a shortage of pollen, bumblebees actively damaged plant leaves and this behavior resulted in earlier flowering by as much as 30 days.

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Pollen-deprived bumblebees bite leaves and may speed up plant blooms

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Hungry bumble bees make plants flower early by cutting holes in their leaves, Science