Over the period of at least 3-4 days, have students record the barometric pressure. This should be done as often as 3-4 times during the school day. Try to time this activity when a storm is approaching. Then ask students why knowing the air pressure would be important to birds. If you were to fill 2 balloons with helium, one when air pressure is high and one when it's low, predict what will happen if you kept them in your classroom for several days.
Some scientists say that animals can sense an earthquake before it hits.
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