Spider vision is rather wonderful... those big eyes have optics like telephoto lenses. Only instead of a 2D retina at the back, they have a kind of 1D 'bar retina' that's scanned back and forth across the image plane, sweeping it in different directions depending on what information the spider needs to pick out from the scene. But no iris muscles or pupil dilation.
Portia jumping spiders have visual acuity comparable to a cat's; they have the brains to stalk other spiders, feint out their prey, and solve visual mazes to reach the destination. Some mates study them at Canterbury University.
When the spider is in locomotion one may notice very quickly that it does not even move like other spiders. The spiders move slowly rocking back and forth much like that of a mantid. While these choppy motions are going the spider is waving its palps and legs. There is no apparent synchrony between palp and leg waving and the choppy motion both seem to be independent. The full behavior appears to mimic that of a shuttering leaf in the wind.
I refuse to click on any speedra links before bed... and refuse to book any more meetings for the rest of the year. Heh. Although... my cranky, former painting students did invite me to their holiday party. Perhaps they were really spiders in disguise. I always thought they were bats...
28 comments:
Oh... nice...
Guess who I thought of when I saw it...
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Jennifer dancing to Lady Gaga?
no thanks, I'm full.
...umm that prior comment was a response to the post title.
Shouldn't be read as a response to fish's comment. I am certain Jennifer is grace personified when when is dancing, whether to Lady Gaga or Styx.
Oh... nice...
Jennifer is holding out for this haircut.
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Dear. Lord. You're linking to fish's photo stream!!!
Didn't I just see you folks at the House of Koi?
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I think my hair is long enough, I'm holding out for this.
That is one healthy mullet.
How much does it eat?
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you know, Jennifer, my sister in law is a hairdresser. I bet she could give you a Geddy-Mulllet.
Oh... nice...
I am not clicking on any of your links.
The worst thing about spiders is not being able to tell whether or not their pupils are dilated.
When you hear the maniacal laughing, you can be fairly certain that a large number of spider pupils are dilated.
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Spider vision is rather wonderful... those big eyes have optics like telephoto lenses. Only instead of a 2D retina at the back, they have a kind of 1D 'bar retina' that's scanned back and forth across the image plane, sweeping it in different directions depending on what information the spider needs to pick out from the scene.
But no iris muscles or pupil dilation.
Portia jumping spiders have visual acuity comparable to a cat's; they have the brains to stalk other spiders, feint out their prey, and solve visual mazes to reach the destination. Some mates study them at Canterbury University.
Perhaps I should write a blogpost for Jennifer.
Perhaps I should write a blogpost for Jennifer.
with amusingly misspelled capshuns.
Perhaps I should write a blogpost for Jennifer.
I think the comment was successful enough. That's all I needed... to know they have super vision for stalking their prey...
Also, they can use the internet where they groom their victims by posing as flies.
Or fish.
Or zombies.
Yes, but as far as I know, although they can jump, they can't yet jump through my monitor.
They are fiendishly clever, Jennifer.
When the spider is in locomotion one may notice very quickly that it does not even move like other spiders. The spiders move slowly rocking back and forth much like that of a mantid. While these choppy motions are going the spider is waving its palps and legs. There is no apparent synchrony between palp and leg waving and the choppy motion both seem to be independent. The full behavior appears to mimic that of a shuttering leaf in the wind.
AKA.
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Oh look, more on the eyes and frighteningly intelligent predation of '8-legged cats'.
they can't yet jump through my monitor.
They will LURE YOU TO A MEETING.
They will provide faked photographs of themselves.
They will LURE YOU TO A MEETING.
They will talk about synergies, and such as.
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I refuse to click on any speedra links before bed... and refuse to book any more meetings for the rest of the year. Heh. Although... my cranky, former painting students did invite me to their holiday party. Perhaps they were really spiders in disguise. I always thought they were bats...
The Humpty Dance did make me laugh.
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