Each segment can produce a new plant and must find a likely spot to root itself in the rocky soil nearby in order for the species to continue. When the segments are mature and ready to begin life on their own, the slightest air movement can dislodge them. Even the whisper of a butterfly wing can send them sailing into the soil below the mother plant where roots will soon begin to gather nutrients for the new plant. Personal painful experience gives rise to the often heard warnings. The teddybear cholla has some of the most ominous spines and often require pliers for removal.
Severe damage can occur to a passerby who gets too cozy with any cholla, but especially a teddybear.
The pain from the spine entering the body can be bad enough, but then it has to come out. The barb on the inserted end doesn't make the exit easy. Cactus wrens and curve-billed thrashers don't seem to mind the spines. Javelina and deer have been seen with cholla joints sticking out of mouths, ears, and some other unlikely spots. Their tough skin must make them immune to the pain.