Night-Tracker Glowsticks, from Hunting Science fasten to virtually anything in the woods.
Place a glowstick in each place you find blood, then glance back at the glow to discern the animal's direction of travel. Just follow the lights for the trip back out of the woods. Each glowstick will shine for up to six hours. Twenty non-toxic glowsticks per box.
Contact: www.huntingscience.com; 888-627-4868