when does the north american butterfly association count butterflies in the us every year
North American Butterfly Association As with the National Audubon Society and the Christmas Bird Count, the NABA holds annual volunteer butterfly counts in the weeks leading up to or after July 4 in the United States, July 1 in Canada, and September 16 in Mexico. Volunteers scout out a meeting place and map out a 15 mile circle in which they count all the butterflies they see in one day. These counts give clues into the butterfly biodiversity of a particular region.
Butterfly effect The term, coined by Edward Lorenz, is derived from the metaphorical example of the details of a tornado (the exact time of formation, the exact path taken) being influenced by minor perturbations such as the flapping of the wings of a distant butterfly several weeks earlier. Lorenz discovered the effect when he observed that runs of his weather model with initial condition data that was rounded in a seemingly inconsequential manner would fail to reproduce the results of runs with the unrounded initial condition data. A very small change in initial conditions had created a significantly different outcome.[2]