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California tarantulas caught in a web of lies

By Gary Bogue
Thursday, October 27th, 2011 at 5:47 am in Spiders, Tarantulas.

California tarantula on Mount Diablo. Photo by Brian Murphy, Walnut Creek, CA
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Dear readers:
The California Department of Fish and Game sent out the news release below about tarantula myths and Halloween. It seems appropriate to print this now, with Halloween just 4 days away. If you are afraid of spiders, I suggest you cover your eyes before reading it. :) /Gary

California Tarantulas Caught in Web of Lies

With Halloween just around the corner, it’s time to crush the myths surrounding one of the season’s most misunderstood critters – the tarantula. These hefty, hairy spiders have been unjustly maligned for decades and Department of Fish and Game (DFG) wildlife biologist Nathan Graveline wants to set the record straight.

Graveline has been fascinated with tarantulas since he was a young boy growing up in the Central Valley, where these spiders enjoy the dry, well-drained soil.

“I handled quite a few tarantulas and was never bitten, but I did get a rash from the small irritating hairs on their backs,” said Graveline.

California tarantula on Mount Diablo. Photo by Brian Murphy, Walnut Creek, CA
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Despite never being bitten, Graveline does not recommend handling these shy arachnids. Although a tarantula’s venom is not lethal, the bite may be painful, similar to a bee sting, due to the size of the spider’s fangs.

“It may be tempting for some to try and handle tarantulas given their docile nature, but while the chance of receiving a bite is small, there is a good possibility of injuring the spider,” he warned.

Graveline has passed his love of tarantulas on to his three-year-old daughter. Living in the Sierra foothills of Sonora, they occasionally see the creatures emerge from their dens and creep across the landscape.
This summer he and his daughter discovered a burrow near their mailbox.
At night they would deposit crickets at the spider’s doorstop then watch it come out to feed. In addition to crickets, the tarantula enjoys beetles sow bugs and other small insects. The spider’s venom reduces the prey to a soft mush, which can be easily slurped up and digested.

The tarantula, unlike the stereotype depicted in Halloween decorations, is a ground dweller. It is too heavy to hang from a web in the rafters, and it does not sit in a web waiting for prey or unsuspecting human victims. Instead, it uses silk to line its burrow and cover the opening, and to aid in the mating process.

During mating season, between September and October, the mature male tarantula (around 7 years old) will leave his burrow in search of a female. In preparation for this quest, he will spin a sperm web, deposit his sperm into it and collect some on his pedipalps – the small leg-like appendages near the mouth – to carry with him. When he finds an ideal mate, the male deposits his sperm into the female using his pedipalps.

“If the male doesn’t leave quickly, he may become the female’s next meal,” Graveline explained.

After mating is complete, the female returns to her den and spins a bed of silk, on which she deposits the fertilized eggs. Then she lays down another layer to create a billowy cocoon for her offspring, who will emerge in six to seven weeks. The baby tarantulas stay in their mother’s den for about a week before they venture out into the world and seek burrows of their own.

These young spiders are particularly vulnerable to predators such as lizards, snakes, birds and the fearsome tarantula hawk (wasp). If she’s careful, the female tarantula can live as long as 20-25 years. The male is not so fortunate, for he will die a few months after mating, if he is not consumed in the process.

So, as you hang your Halloween decorations this fall, remember that, like the docile, much-maligned tarantula, not everything is what is seems.

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6 Responses to “California tarantulas caught in a web of lies”

  1. JackieH Says:

    I don’t mind pictures of spiders, but I’m never at ease when one is close by. They may not be deadly but they just give me goosebumps and I would lose my sanity if a tarantula would drop over me. So far, I don’t harm spiders, because they don’t bite unless threatened.

  2. Rattakin Says:

    Misunderstood? It’s got eight legs and is therefore evil. That’s all I need to know.

  3. Dave Says:

    Spiders have a free pass in my household. Better spiders than flies and other pests. The only spider I would not tolerate are the ones with the red patch on their belly.

  4. Barbara Says:

    Dave: Same (and flies — also no compassion). I will escort spiders out if they’re within the capture range; otherwise, I simply find something else to do. Shower stall — they’re moved (to protect them).

    Years ago I killed two black widows as I went out to retrieve the paper. It was the first time I EVER saw black widows.

    I went through a confessional with the guy in charge of the blog, and was informed of how common they are. I felt pretty ditzy …

    One of these autumns I want to get up to Mt. Diablo to get some photos of the tarantulas. Those would be so cool! And as I type there scoots a little spider up the wall! : )

  5. Rattakin Says:

    Six legs good, eight legs bad.

    We have a ton of black widows here. Bleh.

  6. Rita Power Says:

    Thanks for writing about our sweet tarantulas, I found one on the path at Contra Loma Reservoir last week and moved it to a safer place; I tried to figure out which direction it was heading…SO COOL, I had never seen one since i was a kid on Mt Diablo. :)

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