More quotes from the same article (see link)

"However, all of these signs are not positive indicators of earthquakes, which more often than not occur suddenly and without warning.

Once a region has suffered a major earthquake (measured 7.0 in magnitude or more), it is likely to be safe from further quakes for at least several decades."

The first seems to say the animal behavior is not a precursor to the majority of earthquakes, and the second statement is simply wrong. For example, an M7 in LA would not signal a hiatus in earthquake risk.

Apparently, the writers were a science class that used this children's book as a reference:
http://www.dorlingkindersley-uk.co.uk/nf/Book/BookDisplay/0,,11_0751347523,00.html
to figure out that animals sense earthquakes, according to their bibliography.

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