In the dead of night, dogs howl. Snakes slither away in droves. Moments later, an earthquake upends the landscape. No one sees it coming -- no human, that is.
Can animals sense disaster before it strikes?
It's a mystery that dates from antiquity to the present. Seconds before a 5.8 quake jolted the East Coast in August, apes and birds at the National Zoo in Washington, D.C., reportedly shrieked, scurried to higher ground and huddled together.