According the a study of bird feeding in the United States and Canada called ProjectFeederWatch, window strikes are responsible for more deaths at feeders than cats, hawks or any other factor.
This conclusion is based more than 2,000 deaths reported during the study. According to the analysis of these data, nearly half of all deaths are caused by birds striking windows. If these data are correct, the study leaders estimate that one in ten birds might be killed by flying into buildings annually.
While this is indeed a cause of concern to those of us that feed birds in our backyards, these deaths might represent only two or less percent of North America’s fall bird population.
This conclusion is based on volumes of data collected by literally thousands of citizen scientists that submitted detailed logs a wide range of subjects relating to their bird feeding programs.
This monumental study was sponsored by the Cornell Laboratory of Ornithology, Bird Studies Canada, National Audubon Society, and the Canadian Nature Federation.
Lately it seems like everywhere I go folks are talking about how many hummingbirds are visiting their backyard feeders. Indeed, it seems there is no shortage of these small, flying dynamos invading Georgia backyards this summer. With that in mind, most hummingbird fanciers would like to know how many hummingbirds they are feeding.
Several years ago, an Arizona hummingbird fancier named Stephen Russell came up with a novel way to estimate the numbers of hummingbirds feeding in his backyard. This technique is based on the amount of hummingbird food the birds consume. Here is how it works.
I will not go into all of the calculations he used to determine how many birds a gallon of hummingbird food mixed at a ratio of 1 part sugar to 4 parts water will feed. Suffice it to say he determined that a quart of hummingbird nectar will feed 137.25 birds.
Therefore, if you know how much food disappears from your feeders in a day’s time, you can easily calculate how many birds you are feeding. For example, if the birds consume a pint of nectar in a day, your are feeding roughly 68 hummers.
If you try this technique, let me know what you think of the estimate obtained using the Russell formula.
In the world of the ruby-throated hummingbird, males do not assist the females in nest building, incubation of the eggs, or feeding the young. To the contrary, although males are sometimes seen in the company of females until eggs are laid, their attraction for one another wanes shortly after mating.
If you would like to learn how to better identify birds, but simply didn’t know where to begin, this is the workshop for you.
The workshop will focus on how you can identify the birds that you are likely to see in and around your home.
Topics covered in the workshop will include:
- Tips on identifying birds by sight and sound
- Choosing the right binoculars and spotting scopes
- Selecting the best field guides and other birding aids
- Where to find help indentifying birds
- Sharing your sightings with others
- Much, much more