Approximately, seven percent of the body's blood is in the capillaries which continuously exchange substances with the liquid outside these blood vessels, called interstitial fluid. This dynamic displacement of materials between the interstitial fluid and the blood is named capillary exchange.pproximately, seven percent of the body's blood is in the capillaries which continuously exchange substances with the liquid outside these blood vessels, called interstitial fluid. This dynamic displacement of materials between the interstitial fluid and the blood is named capillary exchange.
The Base Diet for Birds: Food That Is Balanced. In the wild, birds eat a vast variety of foods: seeds, nuts, grasses, flowers, fruits, insects, the list goes on. The change in seasons brings new types of foods, and birds nourish themselves on whatâs available.
But, meal worms are the best food to feed bluebirds and they will readily eat them year-round. During the breeding season, it is nice to feed meal worms because the harried parents will gratefully accept them to help feed their ravenous young.