Which animal can help locate people buried under collapsed buildings?

Compared to humans, they have up to 300 million olfactory receptors in their noses. We only have six million. Additionally, a dog's brain has a portion devoted to odour analysis that is around 40 times bigger than ours. Dogs are also neophilic, which means they are drawn to novel and intriguing smells. Even the most sophisticated machine cannot match the sensitivity of a dog's sense of smell. A single drop of liquid in 20 Olympic-size swimming pools is powerful enough to identify compounds at quantities of one part per trillion. Training allows canines to detect bombs and drugs, track down criminals, and locate bodies.