When it does not move for 3 three days straight.
snails do need other snails around them to be happy because they have remarkable senses and brains.
yes some times snails are if you give it the good care and love it needs it will be happy
Snails are herbovores, and really like lettuce.
All snails that I know of eat algae.
I know its hard to believe, but, ducks do eat snails.
Snails are hermaphrodites; they are both male and female.
do not know
i know that snails have gills i am not sure about the others
snails know where they are going because they have a sencer i dont know what it is called but they hear vibrations along the ground, knowing where they are going or if a preditor is around.
the snails shell will will be hard and not flaking off usually snails lay eggs and mate when they like the temperature and they are happy and healthy. hope this helps :]
Generally snails are not predators, but there is one species that I know of that is a definite predator. The Assassin Snail, or Clea helena, is a freshwater snails that eats other snails and worms. There are a few other carnivorous snails in the Neogastropoda family also.
i sont know