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agate giant african land snail, Latin name Lissachatina fulica, on a stone against a green background

Golden Apple snail in a freshwater aquarium.

snail is walking in the grass, close-up shot

Primer plano de un tronco seco de madera

Slug in the garden eating a lettuce leaf. Snail invasion in the garden

A caucasian hand is holding a White-lip Globe Snail (Mesodon thyroidus--a terrestrial gastropod mollusk) in this Point of View image. There is copy space at the bottom of the image. One antenna is just starting to stick out.

Closeup of a striped grove snail on the leaf

Unknown Helicid garden snail (observed in Southern California) on a cement background

Close up image of a white shell with natural background.

A snail's journey in the garden

Snail isolated on white background

Close-Up Of Shell Clam Against White Background.

Snail shell coiled texture macro web banner- warm brown and golden colored full frame background with selective focus on the center spiral, Fibonacci Numbers In Nature concept

Close up on the shell of a snail. Selective focus, dark background

A small Achatina snail sitting on a stump tilted its Brown sink. Mustache eyes touch grass. Snail in the natural nature.

Primer plano de un caracol pequeño

Macro shot of a brown snail shell, close-up

Snail, close-up.

Snail

Garden snail isolated on white

Snail, a lifeless snail shell in a garden in Brazil, selective focus.

Close up of a Roman Snail (Helix pomatia) with vignette.

Close up of a snail on the ground

Close-up of a crawling Roman snail (Helix pomatia) on a background of wood with leaves in the background.

Hard fresh clam on white background - stock photo.

Macro photography of brown snail shell on white background

Spring mood

Many species of gastropods have a more or less large outer shell: atrophied in slugs, it is large enough to shelter the whole animal in snails for example; it then constitutes protection against predators and drought. These shells, called univalves, have special features compared to the shells of other molluscs. They are optional or compulsory calcicole (limestone obtained in the plants on which they feed or by scraping the calcareous mineral substrates), more rarely calcifuge and in regions with non-calcareous soil can chew the shell of other individuals (case of parasitism), bone, eggshells. The shell is secreted by a thick fold of skin, called the mantle. It is mainly composed of calcium carbonate. Gastropods therefore need a diet rich in calcium.

Brown garden snail on white background

Free Images: "bestof:snail shell slow spiral live aquatic amphibian gastropod mollusc fauna leaves sticking crawling singapore"

Snail,U,_face,_Biscayne_National_Park_2013-01-22-15.20.21_ZS_PMax.jpg

Susan Hewitt with gastropod shell Sept 2011.jpg

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