NOTES ON HOLE SIZE: 1  per Bergmann's rule, some species of birds may be larger in colder climates-e.g., a Canadian starling may be bigger than a Florida starling, thus the Canadian bird might not be able to fit in a certain hole size that its southern version could squeeze into.
A heart palpitation is the sensation that your heart has skipped a beat or added an extra beat. It may feel like your heart is racing, pounding, or fluttering. You may become overly aware of your heartbeat. This sensation can also be felt in the...
Caffeine is probably the TOP reason that people get heart palpitations. Caffeine speeds up the heart and causes it to become more irritable. But it's not JUST the caffeine that causes problems. Many people who get heart palpitations also lace their coffee with sugar or artificial sweeteners, or drink SODAS instead.