In statistics, the coefficient of determination R2 is the proportion of variability in a data set that is accounted for by a statistical model. In this definition, the term variability is defined as the sum of squares. There are equivalent expressions for R2 based on an analysis of variance decomposition.
On average, an ostrich egg weighs about 1.4 Kg (3.1 pounds). On average, an ostrich egg weighs about 1.4 Kg (3.1 pounds).
Like ostriches, emus also swallow stones or small pebbles so as to ensure a smooth digestion process. The weight of a single eatable stone is about 45 grams (1.6 oz); however, these birds have the capacity to withhold more than 700 grams of stones at one time.