Kentucky Coffeetree 7
The Kentucky Coffeetree is considered rare, and this is the only one I have ever seen. "The tough, leathery seed pods are too difficult for many animals to chew through (in addition to being poisonous) and they are too heavy for either wind or water dispersal. It is thus believed that the tree would have been browsed upon by now-extinct mammoths and mastodons which ate the pods and nicked the seeds with their large teeth, aiding in germination" (from the link above).
From On Church Grounds