While collecting frogs from a drift fence, a herd of 400 cattle loudly stomped passed us.  It was somewhat frightening to be in the path of so many large vertebrates that were running blindly through the dry forest from ranchers.  The ranchers herded the cattle to the Palo Verde MINAE station to they could brand the sub-adults.  Boa and I watched while sitting on the fence as the unbranded cattle were roped and unwillingly dragged from the herd by a horse.