Although poachers still kill approximately 100 African elephants every day, conservation groups are working to save elephant populations from extinction. Americans could then tame the wild elephants and put them to work for the economic benefit of the country. Although most elephants, like human babies, grow out of sucking behavior, some adult elephants also suck their trunks when they feel anxious. In 2015, scientists recorded elephants yawning for the first time. iStock.com/filromAlthough scientists speculated that elephants probably yawn, scientists from the University of California, Davis captured the first video of an elephant yawning.