Spider - Macro Videography - Panasonic Lumix + Raynox DCR-250 - Macro Shots
Spider 🕷
Are spiders insects?
Spiders are arachnids. They differ from insects in having only two parts to the body, eight legs not six, six or eight eyes (two in insects) and spinnerets on their abdomens that produce silk.
How many spiders are there that you never see?
A study of an undisturbed grass field in Sussex found 5.5 million spiders per hectare.
How many spiders are there in the average house?
There don’t seem to be any reliable statistics on the number of spiders in the average home, but there are plenty of spiders that will certainly enjoy living in your abode. These include the daddy-long-legs spider Pholcus phalangioides, which makes scruffy webs in the corners of rooms and cupboards, and the mouse spider Scotophaeus blackwalli, a sturdier, velvety species that prowls walls at night.
But the label ‘house spider’ is usually reserved for members of the genus Tegenaria, which lurk unseen in tube-webs until the autumn, when the leggy males scuttle around our abodes in search of the bulkier, more sedentary females.
Four species occur regularly in British houses, though they are tricky to tell apart, and arachnophobes will no doubt be delighted to know that a fifth now seems to be establishing itself here from mainland Europe.
How many eyes do spiders have?
People usually think of spiders having eight eyes, but that’s not always true. While most spiders have eight eyes, there are some that only have six, and even some spiders that have fewer than six eyes. They always come in an even number, though – there are no cyclops spiders!
How do spiders make silk?
Spider silk starts out in the silk glands as a watery gel of long protein chains, which is funnelled down a gradually tapering tube. As the tube narrows, coatings are applied to the mixture (to provide stickiness and water resistance, for example) before it emerges through tiny spigots (devices that control the flow of liquid) on the spider’s spinnerets.
The gel solidifies only when stretched, so rather than being squeezed out like toothpaste, it is pulled out by a motor-like valve in each spigot.
A battery of silk glands produces a wide array of fibres with different properties used for specific tasks – for instance, a dragline, snare, web support or egg case.
Do all spiders build webs?
Only 17 of Britain’s 37 families of spiders use webs to capture their prey. These webs come in many different forms – from the much-admired orb webs of garden spiders and their relatives, to the much less welcome tangle webs of daddy-long-legs spiders.
Some types of webs are enduring structures – the often extensive funnel webs of large house spiders, for example, can last for years and accommodate a succession of different occupants.
By contrast orb webs, produced by just four families of British spiders, are more fragile. Wind and rain damage their structure, while the gluey coating on the spiral thread that ensnares flying insects is rendered ineffective by pollen and dust. As a result the webs are often rebuilt every night – an operation requiring the manufacture of some 20 metres of silk.
Why do some spiders eat their own webs?
Abandoning one web and building a new one every night would be pretty wasteful. Instead, some orb-web-spinners recycle the amino acids that make up the silk proteins by ingesting the silk as they systematically dismantle their damaged webs. Other species simply discard the old silk but one American species uses it to wrap its egg sac.
What do spiders use silk for apart from building webs?
Silk is used to build webs and egg sacs, wrap up prey, help dispersal of young and as safety lines when escaping predators. Water spiders also use silk to hold an underwater air supply.
Spiderlings disperse using silk. They travel to a high point, raise their abdomens and let out one or more strands. On warm days with rising air currents, the spiderlings are lifted into the air and carried away.
How many insects do spiders eat?
Spiders eat large numbers of insects. Exceptionally, one spider may take hundreds of very small flies in one day.
Edible prey is wrapped up in silk. The remains can often be seen attached to the web for those spider species that build them.
Are there any insects that spiders won’t eat?
Spiders avoid unpalatable insects. Burnet and cinnabar moths, for instance, lie still in spiders’ webs and are thrown out by the host.
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Panasonic Lumix DMC-FZ72
Raynox 250 Lens
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