Clambake0351

Where did all those stray feral cats come from?

Dots are cheaper than UV filters and easier to apply retroactively. Both have the same effect of creating a visible obstruction for birds to discourage strikes.

FYI, not all bird glass has visible fritting. They also come with UV reflective coatings that are almost transparent to the human eye (unless you’re really close to the glass), e.g.,

Some UV treatments are stripes, others similar to an elongated version of the fritting from OP, and then there’s the camo-stick-like version above. Stripes are the most noticeable to humans.

ETA: From personal experience, the glass is completely transparent from ~2+ meters away, and you have to be very close or staring directly at glare from the sun to see it when <2m away.

ETA2: Someone else shared the Wikipedia article on bird collisions below, but I wanted to take a second to highlight this graph from the article:

If you think bird safe glass is cool, spaying/neutering your cats and keeping them inside or on a leash is waaay cooler.

(This graph doesn’t include indirect causes of death like climate change, deforestation, and pesticide use, but that doesn’t make responsible pet ownership any less cool)