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Garden Snail
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| Photo Information |
Copyright: Scott McDougall (Taggart)
![Silver Note Writer [C: 0 W: 0 N: 64]](http://i1.treknature.com/misc/n-n-s.gif) (196) |
| Genre: Animals |
| Medium: Color |
| Date Taken: 2005-12-24 |
| Categories: Molluscs |
| Camera: Canon 300D, Canon EF100mm Macro |
| Exposure: f/11, 1/200 seconds |
| Details: (Fill) Flash: Yes |
| More Photo Info: [view] |
| Photo Version: Original Version |
| Date Submitted: 2005-12-24 16:20 |
| Viewed: 1975 |
| Points: 2 |
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| [Note Guidelines] Photographer's Note |
Common snail, garden snail
Helix aspersa
Because of their moist skin, common snails are most active in damp weather and at night.
Physical Description
Common snails have pale grey moist skin. At the front end are four tentacles, the shorter two are for feeling and the longer pair are eye stalks. The shell of these snails is light brown with darker brown bands following the spiral of the shell. The shell colouration varies in its intensity from pale yellow to almost black.
Distribution
They are common and widespread in Britain and Europe.
Habitat
Common snails live in varied habitats. They are often found in gardens, parks, forests and dunes.
Diet
They are herbivores and feed on decaying vegetation, algae, fungi, lichens and plant leaves. As a part of their herbivorous diet they often feed on garden plants and are considered by some to be pests. Common snails have a symbiotic bacteria in their crop that enables them to digest cellulose - they have been known to feed on damp paper and cardboard.
Behaviour
Because of their moist skin, common snails are most active in damp weather and at night. When conditions become too dry, the snail will retreat into its shell and seal the entrance with a parchment-like barrier known as an epiphragm. Snails can often be found in this state under rocks in gardens or on a wall in a sheltered corner. When sealed away like this the snail goes into a state of suspended animation and can survive for several months without water.
Common snails feed by scraping a ribbon-like tongue covered in horny teeth called a radula, over their food. This allows them to scrape algae and lichen from the surface of rocks and walls. You can sometimes see the trails they leave behind as they eat their way through the algae on a damp wall.
Reproduction
Common snails, like all land snails, are hermaphrodites. This means that they possess both male and female reproductive organs. Despite this they still need to find another snail to mate with. When two snails meet during the breeding season (late spring or early summer), mating is initiated by one snail piercing the skin of the other snail with a calcified 'love dart'. The exact purpose of the 'love dart' is not fully understood but it seems to stimulate the other snail into exchanging small packets of sperm. After mating is complete the snails will produce eggs internally, which are fertilised by the sperm that has been exchanged.
Up to about a month after mating the snail lays about a hundred small white eggs in a nest underground in damp soil. If the conditions remain suitable for the eggs, snails will begin to hatch after about 14 days. Newly hatched snails have a small fragile shell and it takes two years for them to reach maturity.
http://www.bbc.co.uk/nature.
Merry Christmas :) |
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- jossim
![Gold Star Critiquer/Gold Note Writer [C: 1575 W: 5 N: 2181]](http://i1.treknature.com/misc/g-n-g.gif)
(12252) - [2005-12-25 14:07]
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Félicitations pour cette belle prise pleine de belles couleurs. L'éclairage est parfait et la netteté excellente.
Merci et Merry Christmas!
