Amazingly, most of the animals knew of it ahead of time and ran for higher ground if they got the chance. The people there didn't get it, so they stayed on the low grounds. Supposedly, they found few dead animals.
Here's a couple of stories I found about it.
http://www.organicconsumers.org/corp/tsunami.cfm
http://www.msnbc.msn.com/id/6795562