Thursday, August 12, 2010

Shots from the past...
A crab spider...
I found this guy in a field near the observatory in Cluj, a couple of months ago, and now I made a bit off research (google) to find out which species belongs to.It's a Crab spider, pls don'n shoot me if I'm wrong, correct me.
Crab spiders do not build webs to trap prey, but are hunters and ambushers. Some species sit on or among flowers, bark, fruit or leaves where they grab visiting insects. They use their powerful front legs to grab and hold onto prey while paralyzing it with a venomous bite. These spiders change color by secreting a liquid yellow pigment into the outer cell layer of the body. On a white base, this pigment is transported into lower layers, so that inner glands, filled with white guanine, become visible. If the spider dwells longer on a white plant, the yellow pigment is often excreted. It will then take the spider much longer to change to yellow, because it will have to produce the yellow pigment first. The color change is induced by visual feedback; spiders with painted eyes were found to have lost this ability.

Some Black and White
Rocks in the sand, near Aghires lake
The valley of Dragan, view from the dam.
The observatory near Cluj ...

1 comment:

aeduard said...

az első két színes kép nagyon tetszik, a virágosnak nagyon szép a háttere