Showing posts with label predatory insects. Show all posts
Showing posts with label predatory insects. Show all posts

Friday, August 20, 2010

Robber Fly

Robber Fly with Kill

There’s a thief among us--
a predator who snatches one, then another, from her lookout on the rusty rail of the field fencing in my overgrown pasture.


She takes to the air and effortlessly grabs hapless insects in mid-flight, wrapping her spiny legs and clawed feet around some larger than herself, while some are smaller and easier prey.

Robber Fly with small wasp or ant

With little chance of escape, they’re instantly immobilized by a dose of neurotoxic and proteolytic enzymes deftly delivered through the tip her dagger-like proboscis.
Within minutes, she’s drinking them down.
Robbed of the life within, an empty shell falls to the ground.

Robber Fly preying upon Common Whitetail Dragonfly

Robber flies are skilled predators of the insect world and, though usually of no harm to humans, able to inflict a painful stab if handled carelessly. Many genera and species exist worldwide, some fairly small and some rivaling bumblebees and dragonflies in size.
This particular individual may be of the genus Promachus or Proctacanthus, both large and aggressive, bearded robbers.



There are many dragonflies left in my field.


Common Whitetail dragonflies
2 males (above) and female (below)

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Friday, September 19, 2008

Olympic National Park--This Place is WILD!

Sign posted at trailhead

I’ve discovered an effective strategy for overcoming my fear of bears.
Settle in for a week of hiking--in cougar country—complete with details of how to avoid, or, if faced with an encounter, stare one down and escape with your life, posted plainly at every trailhead.
A repeated reminder throughout the Park, for those who might have it slip their mind.

Chances are, I’d never encounter one.
But with 300 cougars within the national park boundaries, I read each instruction sheet and studied it well, then picked up my stick and stepped into their world.

Every scrubby cluster became a point from which one could suddenly leap.
Every dark lump, a crouching form.
Hiking no longer was a mindless trek, but an exercise, carefully plotted and executed.
We must keep an eye on the sun--these deep woods lose light quickly.
Stumbling along a dusky trail would be definitely out of the question.

Having just stepped off a plane from Ohio days earlier, made this new place all the more disconcerting. As if suddenly waking from sleep to find the room rearranged, nothing looked the least bit familiar.



Within the deep, dark woods of Olympic, mostly silence. An expansive, lavishly carpeted space with cathedral ceilings opening to spots of bright blue above.



Arion sp. (?)

Snail-eating Beetles eating a worm
Scaphinotus angusticollis olympiae
of Pacific coastal forests

Along the paths we walked, huge slugs.
And their predators, flightless Snail-Eating ground beetles scurrying to and fro, hoping to catch one, or a snail or other slimy, spineless creature that lives in the dark of these woods.

Douglas squirrel, Tamiasciurus douglasii
of Pacific coastal states
eating Sitka Spruce cone

Douglas squirrels, small and noisy, munching cones of odd shapes and sizes.

The evergreens, of course, were huge--and enough like similar species to hazard a guess. But, there were maples--with leaves the size of dinner plates.

Devils Club, Oplopanax horridus

And a low, lanky, creeping shrub, its ferocious spines hiding coyly behind bunches of lovely red berries—and even larger leaves.
Devil’s Club—nothing a hiker wishes to get into a tangle with.

hot springs of Sol Duc Valley

Sulfur hot springs were covered in a morning’s mist. Their aroma less than inviting—yet, after a day’s journeying, a warm welcome home. Nature’s hot tub, clean and clear. A constant renewal from below the earth’s surface.

coast between Clallum Bay and Sekiu

wild blackberries


One afternoon, a barrier of hefty blackberry shoots teased us from the road’s edge with large and luscious ripe fruit as we stopped to watch the tide slip from dark-covered rocks at the coast. We stole all we could of the bright, dark berries, and filled a hat to the brim—a snack to carry us through.



The table for lunch, reminding us again of this wonderful wildness we had landed in.



Rock Crab
Wilderness Beach Trail connecting Alava and Sand Point

Second Beach
Olympic Coast National Marine Sanctuary, Washington

A place where the sand on the beach bears only your footsteps.
And those that follow, are of another world.



Posted in Camera Critters!

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Friday, September 5, 2008

The Great Predator

Chinese Mantid

Last summer I noticed it, too--almost as an overnight change.
Dozens of mantids--where yesterday there had been none, hanging in their upside down pose, densely scattered throughout the flower tops.

The larger ones are the most in number here, Chinese Mantids, with only a few of the smaller European Mantids among them. This year, choosing goldenrod as a hunting ground, where their long, slender green and brown-winged bodies blend perfectly with its leaves.

raptorial forelegs

They step forward slowly and deliberately. Then patiently wait, motionless, for unsuspecting prey.

The wide-eyed triangular head is quick to turn in response to the most minor movement. Front legs grasping in a flash that which wanders carelessly too close. Hungrily devouring every morsel, headfirst. Until only a small scrap of a leg remains.

Mantid with prey

Mantid eating





voracious appetite

I kept one in a terrarium on the porch for a few days, bringing her offerings each morning from the plants in the field. My collection of 2 Harvestmen (Daddy Longlegs), 2 Milkweed Bugs, a shield bug, a katydid and a caterpillar was eaten before noon with no complaint. Even while devouring one held in her right foreleg, the left caught a bug and held it tightly in its vise-like grasp. A two-fisted eater!
(Harvestmen are eaten legs first!)

posing before release to field

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Sunday, August 10, 2008

"Let's be careful out there"

I was drawn to her, as she to the flower.
A Spring Azure the size of a dime, sipping slowly from Boneset in the field of goldenrod. Another of the Gossamer-winged, another Blue, in a rare moment of rest.


I inched the camera slowly forward, catching a picture every several inches until I was almost on top of her. Marveling at her fine features magnified by my lens—the coal black eyes, white-feathered legs, banded antennae…how perfectly lovely on one so small.

Abruptly, her wings flew open and it seemed she lunged forward, further into the flower from which she’d been feeding.
Then fluttered strongly, the dusty blues in reverse.


She’d been caught—in that instant. The powerful mantis-like front legs of an even smaller Ambush Bug held her firmly, while the toxin from its mouth acted fast.

I hadn’t seen her hiding within the white bloom--her light green forelegs the color of plant stems, orange eyes upon a cryptic face, so flower-like. As she waited, poised to snatch a visitor to her flower.

Within seconds both were still.
The open wings of gossamer blue, quiet.





I returned to the field the next morning.
On the leaf below, were 4 blue wings.


Ambush Bugs, Phymata sp., mating pair

click photos to enlarge
(do you see the Ambush Bug waiting in the first photo?)

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Lady of the Field

"In every walk with nature
one receives far more than he seeks.
"
~John Muir


click photos to enlarge

The Seven-Spotted Lady Beetle is an important predator of pest insects, especially aphids, in gardens and fields.
Carefully inspecting each leaf of goldenrod, she rests, before moving on.

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Friday, August 8, 2008

Tiny Potter



Our porch may seem to be the place for a quiet relaxing evening or a nap in the shade of a large overhanging tree, but while I’m away, much happens here.
There’s a little potter working.

I noticed these first yesterday, while one was still uncapped. The open hole, perfectly round. The lip turned out so slightly.
These are the nests of a Potter Wasp.
An egg waits to hatch inside.


I would have loved to watch her form them, small clay pots the size of a marble. Fastened to the window box, beside the white porch rail.
Turning... and circling... until the vessel was complete.
Then capturing food--and sealing it up tight!



From Wikipedia:
It is believed that Native Americans based their pottery designs upon the form of local potter wasp nests.

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Thursday, August 7, 2008

Queen for a Day




















The previous collection of photos was taken over the course of several days.
Queen Anne's Lace fills the fields in late summer.
Her flower heads are home to many insects that both feed off her bracts and blossoms
or wait in their cover for prey.

(Did you find them all?)




Key:
photo 2: tiny unidentified fly
photo 6&7: Black Swallowtail caterpillar
photo 8: Aughochlorini sweat bee
photo 9&10: jumping spider #1
photo 11: ambush bug waiting to strike
photo 12: unidentified fly
photo 13: ambush bug capturing honeybee
photo 14&15: jumping spider #2
photo 16: orb weaver web


See more Skywatch here.

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