For example: Brazil nut trees (Bertholletia excelsa) are dependent on several animal species for their survival.
These large canopy trees found in the Amazon rainforest, rely on the agouti, a ground dwelling rodent, for part of their life cycle. The agouti is the only animal with teeth strong enough to open their grapefruit-sized seed pods. While the agouti eats some of the Brazil nut's seeds, it also scatters the seeds across the forest by burying caches far away from the parent tree. These seeds then germinate and form the next generation of trees. For pollination, Brazil nut trees are dependent on Euglossine orchid bees. Without these large-bodied bees, Brazil nut reproduction is not possible.
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