this is so crazy. this is the mark left on the window by a #pigeon that had flown in the front door and tried to fly straight thru the back

the #pigeons fine 😓

the detail is even more remarkable in person. the beak, tail feathers, the wingspan

what's really scary is i was shown 4 more similar marks on other windows, except from the outside. no wonder windows kill ≈ 1B birds per yr

On #QI i saw there are clear but infrared visible striping one can put on windows that reduces bird collisions