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...
Heart Palpitations. 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 is sometimes also felt in the neck, throat, or chest.While you are having palpitations, your heart rhythm may or may not be abnormal. Heart palpitations can be caused by a variety of factors, including caffeine, exercise, smoking, or stress.Although they can be quite unsettling, most heart palpitations are harmless and resolve on their own without treatment.ou may become overly aware of your heartbeat. This sensation is sometimes also felt in the neck, throat, or chest. While you are having palpitations, your heart rhythm may or may not be abnormal. Heart palpitations can be caused by a variety of factors, including caffeine, exercise, smoking, or stress.