It is said that animals can sense the disasters such as earthquakes,tsunamis etc.... .They are said to have possess some sixth sense or somethind like that to sense it.
For example,
bees leave their hives,dogs bark unnecessary and seems to be very destructive and dangerous,hens stop laying eggs,birds migrate to different places etc..
They have more sensitive sense organs than humans. like an elephant can hear and recognise the voice of another elephant at a distance of about 10 kms. every animal is provided with special sense organs. that's why their behaviour can be regarded as an alarm to earthquakes.