Red-ruffed lemurs at the National Zoo in Washington, D.C., were among the first animals to start sounding the call Tuesday, about 15 minutes before the earthquake hit, and others including orangutans, gorillas and flamingos followed suit with strange behavior in advance of the quake. Theories about why some animals seem to feel earthquakes before they hit range from ideas about mysterious electromagnetic fields to the simpler idea that animals often pay more attention than people to the natural world around them.

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