Sticky feet

Spiders love my kitchen sink. And my bathtub. Maybe they're looking for water, but these are not safe places for them. Mornings, I find them there, scrabbling away at the bottom, trying to climb the damp walls. They can't make it, and I help them, draping a dishcloth or towel over the edge so they can climb out.

Today, though, I found this one very peacefully exploring the sides of the bathtub, never slipping or falling. I wonder about her feet; they look hairy. In some of my photos (blurry, except for a foot or two) they seem to be bifurcated, with two "toes". Are they stickier than most of the other resident spiders' feet, I wonder?

Brown spider, about 1/4 inch long, not counting the legs.

I found an interesting article on Mother Nature Network, titled, "The odd, adorable mystery of hairy spider feet".

"About half of the spider families have claw tufts. These animals usually have only two claws at the tips of their legs, and are usually hunting spiders, who pursue their prey," Platnick says. "Web-building spiders typically have three claws; the two paired claws, like those found in hunting spiders, plus a third, smaller, unpaired claw that helps them maneuver on their silk threads."
...
"The claw tufts of these spiders provide additional adhesive properties, making it easier for the animals to climb," Platnick says. "For example, many tarantulas can even climb up glass, despite their relatively heavy weight."

Here's one of my very blurry foot photos:

A bit hairy, and it seems that it's two-toed.

Of fangs and feet

I went out in a pouring rainstorm to look for sowbugs for my spider momma. grabbed the first thing I saw, and brought it inside. The old smokestack; it would be damp and dark; I could be sure of finding some good spider groceries there.

I hadn't thought of springtails. I think they're too small for my Brownie, anyhow. But there they were; cute, fat, globular springtails, scurrying grey Orchesellas, hints of those blind, white ones, just disappearing beneath flakes of rust. And there was a tiny, golden spider, small enough to consider a springtail a good meal.

Spider on the right, globular springtail hiding in the crack to the left.

Her fangs are as big as the springtails themselves.

Iffy photo. Included because of the claws.

Spiders' feet are complex structures; they have to be for the spider to race along her web, or hang on in a windstorm. (Or to hold onto the windshield of my car while I drive; one came home with me like that from Boundary Bay, 25 km away.)

Spider toes.

First, the tips of the feet are hairy. But those hairs have "feet", themselves; each one ends in a flat suction cup-like structure, and each cup has its own feet.

The end of each leg is covered with thick brushes of hair, and the end of each hair is covered in tiny microscopic "feet." (From How stuff works.) (Diagram here.)

And then, big enough for my camera to get a glimpse of them, each of the eight feet ends in two toothy claws. (Visible on the foot on the left, above.) If the spider is a web builder, like Brownie, she also has a smaller, third claw, behind these two, which is used to hold a strand of silk and slide along it as she goes. The two toothed claws work for general walking.

Diagram of web-walker's foot, from microscopy.uk.org.

So; Brownie got her dinner, a fat sowbug from the smokestack, and she was very excited about it. So much so that she was scrabbling on the wet glass of her box, and not getting anywhere until she decided on a less direct route. Those feet are wonderful, but they don't cling to wet glass!

(More info on spider feet, at Infinite Spider, SpydaWeb, and How Stuff Works.)