I haven’t seen any woolly bears yet this year, though they have always been around, walking up and down the driveway, after the fall equinox. These little black and rust red caterpillars are supposed to tell the strength of the coming winter by the relative length of their central red and both ends black bands. They probably do not—but they do freeze solid and hibernate through the winter that way, sometimes thawing out and moving around again after the first really cold days of fall. They are supposed to be abundant through almost all of North America, so it is probably the unusually warm September that has kept them out of sight—but it makes me nervous when I cannot find the critters I expect to see. Wikipedia is as good a source as any for these guys and the Isabella moths they become—see http://en.wikipedia.org/wiki/Pyrrharctia_isabella.
When we moved to this house thirty-five years ago, the pond was full of frogs and tadpoles—big garumphing bullfrogs, slender leopard frogs, the singing peepers of spring (actually tiny tree frogs), and even a few toads. Occasionally a tiger salamander would wander through, a good ten inches long and shiny black and yellow, reminding me of the seemingly endless tiny salamanders, including the fluorescently orange red efts, that I had watched and sometimes briefly imprisoned as a child in New Jersey. We never touched the tiger salamanders, just watched them in amazement and wished them safe travels on their way, we imagined, to mate and spawn. We probably have not seen a tiger salamander for twenty years, and the pond has gone from a loud bullfrog chorus that frightened city visitors and kept them awake in their beds to a single, infrequent jug-o’-rum. The two boys who lived in the house before we bought it hunted bullfrogs with BB guns for after school snacks, and I have seen a muskrat catch and kill a bullfrog, too. But in those years the bullfrogs never seemed to diminish. True, eastern Nebraska is at the extreme western edge of the bullfrog range (http://en.wikipedia.org/wiki/American_bullfrog), but they used to be here. Last year we could hear peepers on our neighbors’ larger pond, but none on our own, the first such silence in all our years here. Even the year the pond dried up, the spring rains restored it and the tiny magic voices. Perhaps it was something of the extraordinarily early and hot spring the year before that disturbed the peepers. Bullfrogs, like woolly bears, are supposedly common and not endangered, and so are spring peepers, though apparently they have become rare in Iowa and Kansas, our abutting states. (See http://en.wikipedia.org/wiki/Spring_peeper)
Reading a memoir that included a few years on a beach in Staten Island immediately after WWI, I noticed the writer talking about the small pipefish and the many kinds of crabs she found in the tidal pools. Spending summer vacations on a beach further out on Long Island after World War II, I remember the tidal pools, and their fascinating parade of small, dainty, darting creatures, but now the pools are gone from that beach, lost to the seawalls that have been built to protect the very pricey property from the storms of Long Island Sound. The pipefish had already disappeared in my day—where now are the little crabs and starfish and other miniature monsters?
It is so easy not to notice any of these things. My students are mostly unfamiliar with bullfrogs and even peepers. They certainly could not tell you what pond was home to which, nor would they miss their sounds. We know that there are world extinctions of amphibians, an ominous sign, since their moist and porous skins make them good barometers of every ecosystem’s health. (See http://www.nzfrogs.org/Amphibian+Extinction+Crisis.html) We also know that there are problems among the insects, the most ubiquitous of earth’s populations. Monarch butterflies are declining precipitously (see http://www.press-citizen.com/article/20130916/NEWS01/309160020/Monarch-butterflies-facing-steep-decline) and honey bees are suffering “colony collapse” all over North America (see http://qz.com/107970/scientists-discover-whats-killing-the-bees-and-its-worse-than-you-thought/), though the bee keepers at our local farmers’ markets seem to have healthy hives.
So it may be that there is nothing to worry about in the decline of woolly bears and bullfrogs and peepers and pipefish from my life. Maybe it is just normal variation or living on something approaching a continental divide of flora and fauna in the United States. But it makes me sad and frightened.