Evolution photos
Evolution photos
Evolutionary convergence of puncture vine and sandbur grass
Evolutionary convergence of puncture vine and sandbur grass 
 
Puncture vines (Tribulus terrestris, Zygophyllaceae, left) and sandbur grasses (Cenchrus incertus, Poaceae, right) have independently evolved seeds that entangle in mammal fur for dispersal. Photograph by Stanley A. Rice. Appears in Encyclopedia of Evolution (Facts on File).