The critically endangered Roussea flower has been vanishing from Mauritius, an island in the Indian Ocean.
Now scientists have figured out why.
"The blue-tailed gecko is the only pollinator and seed disperser for the flower," says biologist Dennis Hansen. But alien ants that have invaded the island "have also taken a liking to the flower and are scaring the gecko away."
It's a case of an invasive species causing serious disruption to an ancient arrangement between gecko and plant.
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