Caltrops - a Device Built After Nature

[VANDOO]

NATURES CALTROPS, MINERAL, PLANT AND ANIMAL
#1 & #2. THORNS OF THE HONEY LOCUST I HAVE SEEN THEM UP TO 10 INCHES LONG AND THEY WORK WELL IN PIT TRAPS LARGE OR SMALL. ARROW POINTS, POISON DARTS AND FISH GIGS ARE EASILY MADE AS WELL.
#3. MUREX SHELL NOT TO BE STEPPED ON WHILE WADEING BAREFOOT
#4. SEA URCHIN, THIS KIND DOES HAVE POISON AND WILL BREAK OFF IN WOUNDS. I KNOW THEM TO BE VERY PAINFUL.
#5. QUARTZ CRYSTALS THESE AS WELL AS MANY OTHER FORMS WOULD BE PAINFUL TO WALK ON BAREFOOT.
#6. CACTUS

MANY PLANTS HAVE SPIKED OR BURRED SEED PODS TO HELP SPREAD THE SEEDS. THORNS ON THE PLANT ARE MOSTLY FOR PROTECTION. CACTUS SPINES ARE A GOOD EXAMPLE.