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At this time of the year there seems to only be one single thing on the mind of the Black-capped Chickadees…, food. They seem to spend all their time looking for food and feeding and clearly view us humans as a source of food. A 1992 study estimated that chickadees, and similar small birds, need about 10 kcal per day to survive. Chickadees consume a wide range of food stuffs, including insects and seeds. One of their favorite treats, particularly this time of year, are sunflower seeds. According to my calculation a single hulled sunflower seed has on average 0.29 kcal (100 grams of sunflower seeds has 585 kcal, which corresponds to approximately 2000 hulled seeds…, the rest is math). This little fella was thoroughly enjoying his snack and in the pan of a few minutes came by about 10 times to pickup another seed. That means he got about a third of its daily energy intake from the snack we brought. Here is more food for though. An adult chickadee weights about 10 grams and this adult birder weights about 8000 times more. If I would have the same daily per gram energy requirements as the chickadee my total daily energy requirement would be 80000 kcal, about 30 times what it actually is. I would get all my energy from sunflower seeds I would have to consume almost 14 kg of hulled sunflower seeds every day. There is some food for thought. Fortunately metabolic rates in warm-blooded animals does not scale linearly, but that is a different story.
May the curiosity be with you. This is from “The Birds are Calling” blog (www.thebirdsarecalling.com). Copyright Mario Pineda.