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Predators

Drama In The Goldenrod Patch

At this time of year when most flowers have gone by, Canada Goldenrod (Solidago canadensis) is a primary source of pollen and nectar for bees, beetles, butterflies, flies and many other insects. Consequently, goldenrod flowers are a popular place for insect-eating predators to linger.

Recently I spied an Ambush Bug that had captured a fly and had its proboscis inserted into it, contentedly sucking away the fly’s innards while I photographed it.  Unbeknownst to me or the Ambush Bug, another predator, a Bald-faced Hornet, had spied the bug with its prey. Although adult hornets consume liquids, usually sugars like the juice of fruits or nectar, their larvae are raised on a diet of insects, so adults are constantly looking for prey. Suddenly, out of nowhere, the hornet flew in, tussled with the Ambush Bug and flew off with the fly in its mandibles, landing on a nearby branch with the object of its thievery.

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Coyotes Investigating Beaver Lodges

1-21-19 beaver lodge img_6186Over the past century beaver trapping has declined and beavers have returned to many of their former habitats. Wolves also have come back in a few areas (not the Northeast yet) — but most places where beavers now live remain free of wolves. As a result, the beaver population has continued to increase, limited only by a few predators, primarily humans and Eastern Coyotes.

Coyotes are major beaver predators and have established themselves throughout the Northeast partly because of the abundance of prey and partly because of the absence of wolves, who keep coyotes out of their habitat. During most of the year, coyotes can take advantage of beavers that leave their pond to feed on land. When they are in their lodges, however, beavers are fairly safe from coyote predation, especially if their lodge is surrounded by water. Come winter, when ponds freeze and beavers remain in their lodges, coyotes can easily approach an inhabited lodge by walking over the ice. Thanks to the lodge’s two to three-foot-thick walls of frozen mud and sticks, the beavers within are safe. (Photo: signs showing a coyote’s attempt to access a beaver lodge)

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Some Spiders Still Active

10-29-18 march fly and spider_U1A1162Spiders are ectotherms – warmed and cooled by their environment. In the fall, those outdoor species that remain alive through the winter begin preparing themselves by producing antifreeze proteins that allow their tissues to experience below-freezing temperatures. When a small particle of ice first starts to form, the antifreeze proteins bind to it and prevent the water around it from freezing, thus preventing the growth of an ice crystal. Some species survive in temperatures as low as -5 degrees Celsius.

The pictured hammock spider, still active in late October, is nourishing itself by drinking the dissolved innards of a fall-flying March fly, whose name comes from the predominantly springtime flight period of most March Flies (of the 32 species in the genus Bibio in North America, only three fly in fall).

A common belief is that once cold weather appears, outdoor spiders seek shelter inside houses.  In fact, only about 5% of the spiders you find in your house lived outside before coming into your house, according to Seattle’s Burk Museum.  The reason people tend to notice them more inside may be because sexually mature male spiders become more active in the fall, wandering far and wide in search of mates.

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Vulnerable Ducklings

6-20-18 woody & ducklings IMG_8636

There is a reason why ducklings remain with their mother for their first month or two of life. It takes 50-70 days before most ducklings can fly, and survival during this period is highly variable, ranging from less than 10 percent to as high as 70 percent. They are at their most vulnerable during this stage. The most common causes of duckling mortality include predation, adverse weather conditions, starvation, disease, and parasites. The mother offers her young a degree of protection from some of these factors while they are under her care.

Predation is arguably the greatest threat to young waterfowl. Ducklings are sought after by nearly every type of predator, including other birds (eagles, hawks, owls, herons, crows), fish (largemouth bass and northern pike), amphibians (bullfrogs), reptiles (snakes and snapping turtles), and mammals (foxes, raccoons, and mink).  Their odds for survival increase dramatically when the ducklings obtain the ability to fly.  (Photo: female Wood Duck and ducklings)

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Red Fox Kits Maturing

5-25-18 red fox kit_U1A4366Time is marching on…the blue eyes of Red Fox kits are turning brown, as they do once a kit is around two months old. Their coat is slowly being replaced by the reddish hairs for which they are named. While kits still spend most of their time close to their den, individuals will take short exploratory walks by themselves. Frequently they accompany their parent on forays during which they are instructed on the finer points of being a successful predator.

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Ambush Bugs Patiently Waiting To Pounce

8-15-17 ambush bug 049A1961Ambush bugs, a type of assassin bug, are true bugs, in the order Hemiptera. (Although insects are often referred to as “bugs,” technically only insects in this order are classified as bugs by entomologists.) All true bugs have piercing and sucking mouthparts, and wings which are membranous and clear at the tips, but hardened at the base.

 Ambush bugs are usually brightly colored (yellow, red or orange) and have thickened front legs which are used to capture prey up to ten times their own size. They live up to their name, patiently lying in wait for unsuspecting prey, often in goldenrod flowers where they are very well camouflaged. An ambush bug, upon sighting an insect, suddenly seizes the prey in its powerful forelegs and quickly dispatches it with a stab from its sharp beak. It then injects digestive enzymes into its prey, after which it drinks the resulting liquid innards.


Weaning of Red Fox Kits Nearing Completion

4-26 -17 red foxes nursingWhen Red Fox kits are about three weeks old they are introduced to solid food. Their mother’s milk continues to provide them with sustenance for several weeks more but it is increasingly fortified by prey that their parents catch. At about five weeks of age, just a week or so after the kits are seen above ground, the process of weaning begins. The mother physically prevents them from having access to her teats by lying down on her stomach or snapping at her kits if they attempt to nurse too often.

The kits in this photograph, taken on April 26 several years ago, are approximately two months old, enjoying what may be one of the last warm milk meals they will ever have.   Weaning is completed at about eight weeks or a little more, when the kits’ teeth have all come in.

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