Terrestrial snails perform digestion through the incorporation of food into a mucoid mass called a protostyle secretion of digestive enzymes into the forgut followed by absorption of nutrien filtration of food by the mantle cavity use of a crystalline style for the release of digestive enzymes into a mucoid mass
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Hitchhiker Snails: A type of small snail is very widespread in Japan, and colonies of the snails that are genetically similar have been found very far apart. Scientists wondered how the snails could travel such long distances. A recent study provides the answer. Biologist Shinichiro Wada fed live snails to birds and found that some of the snails were excreted alive out the other end. The snails apparently are able to seal their shells shut to keep the digestive fluids from getting in. What is the best estimate for the proportion of all snails of this type to live after being eaten by a bird?
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The snail parasite Leucochloridium is a worm that eats the internal organs of snails, but it must complete its life cycle by breeding in the intestines of birds. Snails that are infected crawl out on leaves during the day, and the parasite pulses in their eye stalks in a way that resembles a caterpillar moving. Birds attack and try to eat the caterpillar. This bizarre adaptation likely evolved through selection to reduce the number of worms in an individual snail, increase the probability that infected snails will be removed from the host population, reduce the virulence of the parasite which can sometimes castrate the host, increase the transmission rate among host snails, and reduce the density of the host population below the threshold value necessary for the parasite to spread.
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snails are eaten by birds. snails with plain yellow or cream shells are generally found in dry grass, while snails with stripes are often found in woodland. suggest why?
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