Named for the warning calls they emit when they are frightened or disturbed, dik-diks are tiny herbivorous antelopes that hail from the shrublands and savannahs of eastern Africa.
Thousands of goats, pigs and other animals die annually in training exercises. The military says such training saves lives, but activists argue that human simulators are more effective.
Video: Some homeowners go for alarms, others choose dogs, but one man in Thailand has opted for a reptilian protection system with 2 adult crocodiles guarding his home.