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Spider ballooning structures. Black, thick points represent the spider's body. Black lines represent ballooning threads. [63] Many small animals, mainly arthropods (such as insects and spiders), are also carried upwards into the atmosphere by air currents and may be found floating several thousand feet up.
[18] [20] Spiderlings are known to survive without food while travelling in air currents of jet streams for 25 days or longer. [5] Some mites and some caterpillars also use silk to disperse through the air. [21] [22] A close association has been found between ballooning behaviors and the ability for a species of spiders to survive afloat on water.
Ballooning is a term used for the mechanical kiting [16] [17] that many spiders, especially small species such as Erigone atra, [18] as well as certain mites and some caterpillars use to disperse through the air. Some spiders have been detected in atmospheric data balloons collecting air samples at slightly less than 5 km (16,000 ft) above sea ...
Spider behavior refers to the range of behaviors and activities performed by spiders. Spiders are air-breathing arthropods that have eight legs and chelicerae with fangs that inject venom . They are the largest order of arachnids and rank seventh in total species diversity among all other groups of organisms [ 1 ] which is reflected in their ...
Swan noted that daytime temperatures at high elevations can actually be higher than lower down, because of the reduction in cloud cover and the thinness of the atmosphere. He recorded daytime temperatures at an elevation of 5,500 m (18,000 ft) of 33 °C (92 °F) on rock surfaces and a more constant 16 °C (60 °F) at a depth of 15 cm (6 in ...
Bats, after rodents, have the most species of any mammalian order, about 20% of all mammalian species. [12] Birds have the most species of any class of terrestrial vertebrates. Finally, insects (most of which fly at some point in their life cycle) have more species than all other animal groups combined.
Spiders' legs are made up of seven segments. Starting from the body end, these are the coxa, trochanter, femur, patella, tibia, metatarsus and tarsus. The tip of the tarsus bears claws, which vary in number and size. Spiders that spin webs typically have three claws, the middle one being small; hunting spiders typically have only two claws.
The stratosphere is the second-lowest layer of Earth's atmosphere. It lies above the troposphere and is separated from it by the tropopause. This layer extends from the top of the troposphere at roughly 12 km (7.5 mi; 39,000 ft) above Earth's surface to the stratopause at an altitude of about 50 to 55 km (31 to 34 mi; 164,000 to 180,000 ft).