Mystery #4Tier 2-3plants / poison
Why are some pretty berries deadly poison to eat?
Some of the prettiest berries in the hedgerow are deadly. A few shiny black or bright red beads can make an animal, or a person, dangerously ill. The plant spent real energy filling those berries with poison. So what on earth does a plant gain by growing fruit that hurts whoever eats it?

Your guess
What could a plant possibly gain by making its berries poisonous?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
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