Laserfiche WebLink
(8) Lighting. —Parkins et al. (2015) found that light emission from buildings correlated <br />positively with percent glass on the fagade, suggesting that lighting is linked to the <br />extent of windows. Zink and Eckles (2010) reported fatality reductions, including an <br />8o% reduction at a Chicago high-rise, upon the initiation of the Lights -out Program. <br />However, Zink and Eckles (2010) provided no information on their search effort, such <br />as the number of searches or search interval or search area around each building. <br />(9) Height of structure. —Except for Riding et al. (2020), I found little if any hypothesis - <br />testing related to building height, including whether another suite of factors might relate <br />to collision victims of high-rises. Are migrants more commonly the victims of high-rises <br />or of smaller buildings? <br />(10) Orientation of fagade.—Some studies tested fagade orientation, but not <br />convincingly. Some evidence that orientaiton affects collision rates was provided by <br />Winton et al. (2018). Confounding factors such as the extent and types of windows <br />would require large sample sizes of collision victims to parse out the variation so that <br />some portion of it could be attributed to orientation of fagade. Whether certain <br />orientations cause disproportionately stronger or more realistic -appearing reflections <br />ought to be testable through measurement, but counting dead birds under fagades of <br />different orientations would help. <br />(11) Structural layout. —Bird -safe building guidelines have illustrated examples of <br />structural layouts associated with high rates of bird -window collisions, but little <br />attention has been directed towards hazardous structural layouts in the scientific <br />literature. An exception was Johnson and Hudson (1976), who found high collision <br />rates at 3 stories of glassed -in walkways atop an open breezeway, located on a break in <br />slope with trees on one side of the structure and open sky on the other, Washington <br />State University. <br />(12) Context in urban -rural gradient. —Numbers of fatalities found in monitoring have <br />associated negatively with increasing developed area surrounding the building (Hager et <br />al. 2013), and positively with more rural settings (Kummer et al. 2016a). <br />(13) Height, structure and extent of vegetation near building. —Correlations have <br />sometimes been found between collision rates and the presence or extent of vegetation <br />near windows (Hager et al. 20o8, Borden et al. 2010, Kummer et al. 2016a, Ocampo- <br />Peiiuela et al. 2016). However, Porter and Huang (2015) found a negative relationship <br />between fatalities found and vegetation cover near the building. In my experience, what <br />probably matters most is the distance from the building that vegetation occurs. If the <br />vegetation that is used by birds is very close to a glass fagade, then birds coming from <br />that glass will be less likely to attain sufficient speed upon arrival at the fagade to result <br />in a fatal injury. Too far away and there is probably no relationship. But 30 to 50 m <br />away, birds alighting from vegetation can attain lethal speeds by the time they arrive at <br />the windows. <br />(14) Presence of birdfeeders.—Dunn (1993) reported a weak correlation (r = 0.13, P < <br />0.001) between number of birds killed by home windows and the number of birds <br />