The reason why you should not pick up snails is because picking up snails can cause fatal injuries to the snails which is also known as mantle collapse.
Snails use strong muscular suction to adhere to surfaces and forcing the snails off of the surface can tear the snails body away from their shells.
Snails also should not be picked up as snails can vary parasites, which can cause disease in humans.
Slugs and snails can carry parasites such as rat lungworm, which can result in severe and even potentially fatal brain swelling or meningitis in humans if they come into contact with your skin or if the snail is handled and then your hands are not washed.
And any sudden movement can cause the snail to experience significant stress, which causes the snail to retreat into their shells.
If you do need to pick up a snail, you should ideally wear gloves and tap the snails shell gently, until the snail retracts it's body inside it's shell.
Then once the snail has retreated into it's shell, you can safely lift the snail without damaging the snails mantle.
Unlike humans snails do not feel pain like humans in the emotional or conscious way that us humans feel pain.
However snails do possess a nervous system that allows the snails to detect and to react to damaging stimuli.
Although snails do lack the complex brain structures that are needed to feel pain like humans do including emotional pain, there is evidence that does show that snails do have nociceptors, which causes the snails to avoid harm, which is similar to that of a reflexive, survival based mechanisms.
Land snails also have nervous systems that react to any harmful or noxious stimuli, like chemical stress or extreme heat.
Snails are also not afraid of falling, harsh weather or even storms and are described as being, "not afraid of going slowly".
Snails are very secure in their shell, which serves as a protective house against dangers to the snail.
Because the snails stick closely to surfaces like fruit, leaves or grass, the snail has no fear of falling.
And snails are also fearless against heavy weather or storms and snails are not afraid of walking.
Snails are also unfazed by moving slowly, which represents their patience and determination and they are very patient and determined.
A snail can also have 25,000 teeth depending on the species of snail.
Certain species of snails, including slugs can have 25,000 or even more microscopic teeth.
Some certain species of snails can even have up to 25,600 microscopic teeth, which are tiny teeth that are arranged in rows on a ribbon like tongue that is called a radula, which the snails use to scrape or rasp food particles.
Instead of chewing food, snails instead use their radula to grind and shred and scrape food, which includes leaves and algae.
The snails teeth are located in the snails mouth, which is only around the size of a pinhead and as the snails front rows of teeth wear down from feeding, new rows of teeth also move forward to take their place.
And while some species of snails have over 25,000 teeth, the total number of teeth a snail has varies by species, with many snails still having thousands of microscopic teeth.
Snails also have more teeth than any other animal on earth, which includes Sharks.
Some snails like certain land snails can also sleep up to 3 years at a time.
The certain land snails that can sleep up to 3 years at a time, do so in a state of deep hibernation or estivation.
The state of deep hibernation or estivation that some snails can do is described as a 3 year sleep.
The snails that sleep up to 3 years at a time, do so to survive extreme droughts, or cold by sealing themselves in their shells with mucus in order to conserve moisture and energy.
However the sleeping for 3 years that snails do, is not a typical or regular sleep like daily sleep.
Instead the 3 year sleep that snails do, is a profound hibernation, (cold) or estivation (warm/dry) state called torpor.
Snails sleep for the 3 years as they need high humidity to survive, and if the weather is too dry or to cold for an extended period, the snails will enter the dormant state to prevent dehydration and help them survive.
The snails survive by sealing their shell opening with a hardened mucus layer, that is known as an epiphragm and then they slow their metabolism drastically.
In normal conditions, snails don't have a 24 hour sleep cycle, although they instead snails cycle through about 15 hours of sleep, that is then followed by 30 hours of activity.
Although snails can sleep for 3 years at a time, it's not all that common, and snails will also wake up sooner if their environmental conditions improve.
Land snails are terrestrial gastropod mollusks that breathe air, have a shell (though slugs are shell-less relatives), and move on a muscular foot, leaving a slime trail.
The land snails are found globally in diverse habitats, from forests to cities, and are known for their slow movement, nocturnal habits, and need for moisture, often eating decaying plant matter and requiring calcium for their shells.
Land snails are classified as mollusks (phylum Mollusca), class Gastropoda, adapted for life on land.
Land snails usually possess a shell, a muscular foot for locomotion, and 2 pairs of tentacles, which includes upper tentacles for eyes and lower tentacles for smell and touch.
Snails that are on land breathe through a lung like organ, with a visible opening, called pneumostome on the right side.
And land snails are also primarily herbivores and eat decaying plants, fungi and sometimes protein and need calcium for their shell growth.
Land snails are also often nocturnal or crepuscular and are active at dawn/dusk and most active in warm, humid conditions.
The land snails can also retract into their shell and seal the opening with a mucus layer called "epiphragm" to survive dry periods also known as aestivation.
Land snails are also found worldwide in nearly all terrestrial environments, which includes deserts and tropics, except in Antarctica.
Land snails are also common in wetlands, leaf litter, gardens and forests.
Common examples of land snails are the garden snail also known as the Helix Aspersa, which is a common European species of land snail
And the Giant African Land Snail or Achatina fulica, which is a very large, invasive species of land snail that is known for damaging agriculture.