Large amounts of grass grow in the tundra in the polar summer, and birds come to eat this grass and nest away from predators.
The taiga doesn't have as many plant and animal species as the tropical or the deciduous forest biomes. It does have millions of insects in the summertime. Birds migrate there every year to nest and feed.
About 15 million birds die each year
90,000 birds per year
Over 1,000 birds each year die from smashing into windows
There are no native animals on the Antarctic continent. Some sea birds come to its beaches to breed each year.
about 1,000,000 each year
1963.
There are hundreds of birds that die each year from crashing into windows. These bird are likely in pain anyway.
a path many migrating birds follow each year after year
IF you can extrapolate that across the full year, that would be an average of 35.5 birds killed by each cat/each year. IF you can use that figure for all outdoor cats, you get a calculation of 4.1 billion birds killed each year.
5000000000000
about 39-100