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...
Causes of heart palpitations. Heart palpitations are frequently caused by stress or anxiety. In addition to making you feel terrible emotionally, stress can have a physical effect on your body. As a result, stress can cause the nerve endings that control your heart to fire more frequently or irregularly. Anxiety and panic attacks can also trigger palpitations by elevating adrenaline levels. Food and drink can cause heart palpitations. Caffeine, nicotine, and alcohol can all affect your heart rate and may also increase the likelihood of irregular heartbeats. Some medications can cause heart palpitations. These include asthma inhalers, over the counter medications such as pseudoephedrine, and thyroid medications.