Plants develop tasty fruit mainly because the animals that eat it help disperse the seeds. The berry plant Ochradenus baccatus takes this a giant step further, with an enzyme and catalyst formula that causes mice to do its bidding. You know, like those drain cleaners that mix two chemicals to become extra-powerful for a short time. Read all about it and other examples of symbiosis at Environmental Graffiti. Link
(Image credit: Marcel Burkhard)