What is causing the level of fluid in my hummingbird feeder to go up and down?
July 18, 2012 6:19 PM Subscribe
The amount of hummingbird food in my feeder is going up and down on its own. What's going on? Is it possible that it's acting as a thermometer or a barometer?
posted by waldo to science & nature (30 answers total) 4 users marked this as a favorite
This morning my wood-and-glass hummingbird feeder was empty. At 5 PM it was 1/8 full. Now it's empty again.
My best guess was that this is resulting from changes in temperature or barometric pressure. At 11 AM it was 985 hPa and 88°F. At 5 PM it was 983 hPa and 89°F. And now it's 983 hPa and 82°F. So that doesn't seem to explain things.
Short of a hummingbird regurgitation, I'm out of ideas. Any suggestions as to what's going on here?