I saw Jack Hanna on Anderson Cooper the other night. He is annoying but does know animals. He had a few interesting quick statements to make about animal behavior.
Let's see. Elephants feel vibrations very sensitively with their feet. For hundreds of miles! Surely they felt the vibrations of untold gallons of water coming towards the coast. They put up their trunks and trumpet to signal danger to their tribe. Other animals see this and also scoot the danger zone. They are all interconnected and leave en mass.
Out in the water, fish and esp dolphins, have differing degrees of sonar. They sense the unusual danger and start to move out of the way. Birds preying on the fish, see them moving in unusual patterns and get freaked and head inland to safety. Migratory birds also have a highly developed magnetic sense which might come into play as well. The land animals see the birds coming in and this confirms the danger and reasons for flight.
He also said how he is in tune with animals when he is out camping. By the sounds squirrels make, for ex, he can sense a predator nearby, be it a bear or puma. All humans once were this connected and inter-dependent on nature (animals and other signals) but we "civilised people" have lost it.