These brainy black birds are more than their unmistakable crow call. They've been a synergistic part of humanity's evolution.

Country music singer Charley Crockett was born and raised in Texas, grew up in a single-wide trailer with his mom and says his family lineage traces all the way back to the frontiersman Davy Crockett.

Charley Crockett spends so much time on the road, he says he sleeps better on his bus than on a real bed. "That big diesel motor sings me lullabies at night," he says. "It really is comforting to me.

Charley Crockett spends so much time on the road, he says he sleeps better on his bus than on a real bed. "That big diesel motor sings me lullabies at night," he says. "It really is comforting to me.