
It was absolutely thrilling last week to get confirmation of the existance of the Ivory Billed Woodpecker. A bird thought to be extinct.
People have been looking for the bird for the past few years and there have been tantalizing hints that the large woodpecker (second largest in the world) was indeed alive and well in the Southern US.
Efforts to find the bird over the years have been hampered by the terrain which is typically flooded swamps and bayous. But find it they have and now birders have another box to check off on their list and another Mecca to journey to.
Why did the bird become so rare? Here’s a good backgrounder:
The story of the ivory-bill is apparently closely connected to the history of our forests. The species was a creature of mature, or old growth, southeastern bottomland forests. It was essentially restricted to these kinds of habitats. Within these forests it was most commonly associated with “die off” areas resulting from fire, wind, drought, or insect attack. According to the Audubon Land Bird Guide by Richard Pough (Doubleday & Company, Inc. 1946, 1949) “_ _ _it is most abundant where there has been an abnormal tree mortality. It is likely that most nesting has always been in ‘die off areas’. A normal healthy forest has a low carrying capacity for ivory-bills”. Unlike our many other woodpecker species that thrive in mature bottomlands, but also do quite well in younger second growth forests, the ivory-bill could not make this adjustment. When the old growth bottomland forests were extensively harvested to meet demands for forest products; the ivory-bill was deprived of its life source.
A major part of that life source was a food supply that was rather restricted. While ivory-bills sometimes ate various fruits and nuts, like most woodpeckers they thrived on insects (its scientific name, Campephilus principalis, means “the principal lover of grubs”). However, unlike other woodpeckers that drill into trees to obtain burrowing insects in sections of dead or diseased heartwood, the ivory-bill depended on insects that live just under the bark of recently dead and dying “upright” trees. Rather than drilling into these trees, they stripped the bark away to expose their food source. Standing dead trees of mature size are not a common item in young, second growth forest stands. Indeed, such trees are only relatively abundant in expansive stands of older growth. As our old growth bottomland forests were depleted, so was the ivory-bill’s primary food supply.
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