After all, one of the virtues of bird is that they can be used to motivate research into insects. That’s nice. We couldn’t possibly get the general public interested in arthropods when there are charismatic warm-blooded flying things to save.
Juncos are known as seed-eating birds. They spend their days rummaging through the undergrowth searching for fallen seeds. At feeders, they prefer smaller grains, like millet. But seeds don’t provide the protein juncos, or any songbirds, need to grow a new set of feathers while they molt. And the protein this baby junco needs to molt its blotchy juvenile feathers and to grow sleek stone-gray feathers on top and white ones below would come only from bugs. In fact, 90 percent of the more than 10,700 known bird species rely on insects for food during at least part of their life cycle. Even the most dedicated seed-eating songbirds must eat insects and other arthropods, that many-legged group of creatures that includes spiders and millipedes, to produce eggs, to grow new feathers and to feed their young. Without insects, in other words, they wouldn’t survive.
So, yes, we should care about the health of insects because they are bird food, and birds are dependent on insects for protein. That’s why we should care about this next terrifying statistic.
Unfortunately, insects are disappearing at a rate of about 1 to 2 percent a year. And the decline is not limited to just one species nor just one group of insects. The data suggests that the decline is widespread, even global. These findings have been confirmed in hundreds of rigorous, peer-reviewed studies, says David L. Wagner, a University of Connecticut entomologist and the lead scientist of a program known as the Status of Insects, which coordinates pertinent research on insect populations from around the world. “The weight of the evidence is clear,” Wagner says. “I feel like it would stand up in a court of law.”
That 1 to 2 percent is a mean. I think from what I’ve seen here, in this rural agricultural region, is that it is much higher — the population of visible, obvious insects is less than half of what it was when I moved here 25 years ago. Less dense clouds of insects clustered around street lights. Car grills that are no longer choked with splattered bugs. Fewer reports of clouds of mayflies rising off lakes.
I think it’s scary without even considering bird populations. We’re wiping out a key component of the food web here. Do we have to wait for birds to drop out of the sky or bird song to fade from the dawn symphony before we will care?
Besides, as we all know, insects are spider food. Getting the public to care about spiders is probably an even harder sell.