I thought this article about how the animals at the National Zoo in DC acted strangely right before it happened.
http://www.washingtonpost.com/nation...e=home_oneline
"Her name is Iris, and with her straight, elegant, red-orange hair she is beyond dispute the prettiest orangutan at the National Zoo. She’s calm, quiet, unflappable. “Iris lives the life of a queen,” says great-ape keeper Amanda Bania.
On Tuesday afternoon, the queen lost her cool.
It happened a little before 2 p.m. Primate keeper K.C. Braesch was standing just a few feet away when Iris emitted a loud, guttural cry, known to scientists as belch-vocalizing. Iris then scrambled to the top of her enclosure.
Braesch stepped back and scanned the enclosure to see what might have agitated the ape. Was it Kiko, the male? Although generally a lump, Kiko can turn into a hothead and throw things. But no, Kiko was lounging.
Then — all this had happened within about five seconds — Braesch felt the earthquake."