July 08, 2015
Spider photographer and collector’s legacy lives on
September 19, 2013
Spider Myth: "Why are there more spiders in late summer?"
Every August and September, people ask spider researchers, "why are there so many more spiders this year than usual?" This time of year is when people notice spiders more frequently, but that doesn't mean the overall number or variety of species increases. In fact, there are relatively few native species of spiders around in August and September because it is the driest season.
Here in the Seattle area, a few large non-native spider species, including the cross orbweaver and giant house spider, make themselves more noticeable in late summer.
While orbweavers are more than 100 times as abundant in May just after they hatch, their webs are tiny and not noticeable at that point. By late summer, orbweavers are mature and building much larger webs that put them more conspicuously out in the open.
October 01, 2010
Q: Are there more big spiders now than usual?
Q: Are there more big spiders now than usual? I seem to be constantly running into webs on my outdoor walks.
A: (From Rod Crawford, curator of arachnids at the Burke Museum)
The spiders you're "running into" are mainly one species of non-native orbweaver: the "cross orbweaver" Araneus diadematus, which is native to Europe (first record of a cross orbweaver in Washington is 1927). Orbweavers are the spiders that make orb webs, and are the only spiders that do so. They are not dangerous to humans. The population dynamics of this one species are far from typical of all spiders. The vast majority of spiders actually "lay low" in August and September because of low moisture availability in their habitats.
So, are cross orbweavers more abundant this year than usual? Well, I've been working on spiders at the Burke Museum for 39 years now... and every single year I've had someone ask that question! They can't be more numerous every year than every other year, but populations do have ups and downs within individual neighborhoods. Beyond that, I think the biggest factor is that once your eyes begin to notice spiders (which are always common), you're naturally going to notice them everywhere.
To find the answers to more frequently asked questions about spiders, visit our Spider Myths website.
September 22, 2010
Photos from Bug Blast
September 13, 2010
Beneficial Bugs
One insect found throughout Western Washington that’s good for our homes is the ground beetle. There are numerous different species that reside in damp areas. As larvae and as adults, ground beetles eat slugs and snails that invade our backyards. Large mandibles (pinchers) help them eat a variety of large and small prey. They also eat what many consider to be garden and house pests, such as house fly maggots and cutworms.
An adult Common Black Ground Beetle, photo courtesy of Washington State University
Want these predacious ground beetles to live in your backyard? These nocturnal animals like to hide during the day, so providing logs, rocks and soil areas for ground beetles can result in them staying in your yard. Also, only use pesticides when necessary, and spray directly on the plants in jeopardy. Reducing pesticide use saves ground beetles, which reduces the need to use pesticides!
To learn more about the bugs in your backyard, come to the Burke Museum’s Bug Blast on Sunday, Sept. 19 from 10 am – 4 pm. You can see bugs, touch bugs, and even eat some chef-prepared bug dishes!
Posted by: Andrea Barber, Communications
September 09, 2010
Q: How dangerous are spiders to humans? Should I be scared about the spiders in my house?
Q: How dangerous are spiders to humans? Should I be scared of the spiders in my house?
A: House spiders prey on insects and other small creatures. They are not bloodsuckers and have no reason to bite a human or any other animal too large for them to eat. In any interaction between spiders and larger creatures like humans, the spiders are typically the ones to suffer.
Although almost all spiders are venomous, very, very few spider species have venom that can harm humans, dogs, or cats. The purpose of spider venom is to subdue the spider's prey, almost always insects. In brief, it's an insecticide. Spider venom does not exist to harm creatures, like humans, which are too large for spiders to eat, and in nearly all cases has little if any effect on humans.

A minority of spider species have venom that can cause localized pain in humans, like the venom of bees or wasps. Of around 50,000 spider species known, only about 25have venom capable of causing illness to humans. These species are called "medically significant" spiders. In most parts of the world, such as the Puget Sound area, no spiders with medically significant venom have much chance of being found in houses.
To find the answers to more frequently asked questions about spiders, visit our Spider Myths website.
October 27, 2008
Check out photos from Bug Blast
September 23, 2008
Bug Blast Looms: Don't miss this Sunday's amazing event!!
The first annual "Bug Day" event was organized by members of Scarabs: The Bug Society in 1988. The rationale was, and still is, to bring together kids interested in bugs from around the Puget Sound area and show them they are not alone. In their everyday lives, peers who think that bugs are “yucky” may surround these kids. Another main purpose is to show everyone that bugs are cool and people who like them aren't weird.
This year's event is the 10th since the bug days became "Bug Blast” at the Burke in 1999. Returning by popular demand is bug chef David George Gordon, author of The Eat-A-Bug Cookbook, who was with us back at Bug Blast No. 1. While I find crickets and grasshoppers especially tasty, David can make even a tarantula taste good—and insects are good for you too, often with 60% protein. Try one, you'll like it; cooking demonstrations on the Burke's front lawn are at 11 am, 12:30 pm, and 2 pm.
But that's far from all! There will be vast displays of private and public collections, including specimens never shown before; live ant and honey bee colonies, stream bugs, giant zoo insects from three zoos, tarantulas, carnivorous plants and more. Activities will include compost bug digging, microscope viewing, looking at the world through compound eye glasses, and making a craft called "Bugs of the Future." Dr. Glenn Kohler, the new state forest entomologist, is new to Bug Blast; he'll demonstrate the work of wood-boring beetles, "using baked potatoes as a surrogate for wood." And much more!
Please join us for Bug Blast, Sunday September 28, at the Burke Museum, 10 am to 4 pm. You'll be glad you did!
June 19, 2007
Field Work Doesn’t Always Work Out as Planned
Spider curator Rod Crawford shares the ups and downs of one of his latest field adventures... My most ambitious (and, with the price of gas, expensive) spider collecting field trip of the year was to be a Memorial Day Weekend expedition to northeast Washington, in collaboration with Larry McTigue, an old friend from my caving days who wanted to hunt for new caves in the limestone deposits. The plan was to start in southern
Photo: Female Evarcha proszynskii from Wolfe Camp Road by Rod Crawford
May 02, 2007
Spider collecting trip
Burke spider curator (and author of Spider Myths!) Rod Crawford takes us along on a recent spider collecting trip…
list Laurel Ramseyer (recently arrived from Michigan via Massachusetts) wanted to find out what spider collecting was like. Our first joint site was
The little tree clump (isolated among miles of sagebrush) that I'd found on aerial photos turned out to be Laurel spotted the best spider of the day, Misumenops importunus (one of the flower crab spiders) lying in wait for pollinators among the flowers on a gooseberry bush. It was the first record of the species from eastern Washington! Laurel was most impressed by a large male jumping spider, Phidippus johnsonii, with a bright red abdomen, but he could see her coming and refused to be collected. I later found one in a retreat under a board at dusk.

The only humans we saw all day were two young ladies ascending the canyon on muleback and horseback. The natural flora and fauna of the canyon (the latter including many bees, bee flies, and beetles) all contributed to a most satisfying day. And our collections (including three species brought back alive for rearing) filled in yet another of the many blanks on the Washington spider distribution maps.
Of course, immersion in nature means encounters with not only herbivores and predators, but also parasites - cattle ticks were more common than some people would have found quite comfortable. But the true naturalist can't let such small things detract from fullest enjoyment of the first spring field trip!
More photos and other details on this trip can be seen on this album page from the Spider Collector's Journal site.
Photos, from top to bottom:
Stone Quarry, photo by R. Crawford
Phidippus johnsonii, male, photo by R. Crawford
Misumeops lepidus on a balsamroot flower, ready to embrace a bee, photo by L. Ramseyer








