Tuesday, April 28, 2015

Working on ID (Bldg. 11B).

Our first Ruby-throated Hummingbird of 2015 (Bldg. 11A).

Monday, April 13, 2015

Confirming ID (Building 11B).

Light, Glass, and Bird—Building Collisions in an Urban Park

"Only 37 percent of carcasses were found by our monitors, suggesting that our estimate of bird mortality due to collisions has been too conservative."

Northeastern Naturalist 22(1):84-94. 2015
doi: http://dx.doi.org/10.1656/045.022.0113
No Access
Kaitlyn L. Parkins1,2,*, Susan B. Elbin1 and Elle Barnes1,3
1 New York City Audubon, 71 West 23rd Street, Suite 1523, New York, NY 10010.
2 Fordham University, 441 East Fordham Road, Bronx, NY 10458.
3 New York University, 70 Washington Square South, New York, NY 10012
* Corresponding author - kaitlynlparkins@gmail.com.
Manuscript Editor: Greg Robertson


Building collisions are a significant threat to birds in North America, and urban areas can be particularly hazardous to birds using city parks as stopover habitat. We examined the effects of light and glass on bird—building collisions in an urban park using New York City Audubon's collision-monitoring data from fall migration 2013 and photographic analysis of building facades. We found a significant positive relationship between the number of collisions and interior building light (rho = 1); however, the amount of light was strongly correlated with the amount of glass in building facades (r2 = 0.82). Carcass persistence at the site was examined using tagged, dead birds. Only 37 percent of carcasses were found by our monitors, suggesting that our estimate of bird mortality due to collisions has been too conservative. The amount of glass on a building facade may have an equal or greater effect on bird— building collisions than the amount of light emitted from the facade. Mitigation of both light and glass are needed to reduce bird—building collisions in urban areas.

How a giant Manhattan building learned to stop murdering birds

"Roughly 470 birds were killed over a five-year period between 2005 and 2009. It was quite grisly."

In comparison, the buildings at the VTCRC killed 192 birds in 1 year.


Wednesday, April 1, 2015

Glass architecture is killing millions of migratory birds

"Most casualties are small—sparrows, starlings, warblers, and wood thrushes (which happens to be Washington’s official bird). Twice a year during spring and autumn, millions of birds travel thousands of miles, tracing ancient routes or flyways in search of fertile feeding and nesting grounds."

"Frequently, birds are lured by artificial lights or become disoriented by smooth, transparent surfaces and slam right into the glass. Most die on impact; those that are maimed often fade overnight before the Lights Out crew can come to their rescue."