FOR THE BIRDS

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FOR THE BIRDS Student Name:_____________________________________________ Date:_____________________ Your neighbor, an ornithologist, has to leave for the weekend to do a research study. She has asked you to make sure her birdfeeder always has food in it so that the birds keep coming back throughout the day. Refilling too seldom will cause the birds to look elsewhere for food; refilling too much will scare off the birds. © Ken Hutchinson | Dreamstime.com Leading Question How often should you feed the birds so they keep coming back? 22
FOR THE BIRDS Student Name:_____________________________________________ Date:_____________________ 1. Your neighbor told you that it’s important not to fill the feeder too often or to fill the feeder too seldom, so how can you determine how often to fill it? What’s mathematically important about how the birdfeeder empties? Are there any important variables? 2. When you go over first thing in the morning, the birdfeeder — which has 4 holes, one pair near the bottom and another pair about halfway up (shown in the picture) — is nearly full. You check back 45 minutes later and it’s about half full. When do you expect it to empty again? Perches Feeding Holes 3. You come back 45 minutes later and it’s still not nearly empty. Why is that? The birds are still coming by consistently to eat, so they still are hungry. When should you expect the feeder to be nearly empty and ready for you to fill it again? 4. Describe a method for calculating when the birdfeeder should be empty. Use mathematical notation, if you can. 23
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FOR THE BIRDS

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