But it is not an invasion like this one last year (see here).
I read today that the snail Lymnaea makes decisions by using only two types of neuron: one deciding whether the snail is hungry, and the other deciding whether there is food in the vicinity. I have to admit that I seem to turn into a Lymnaea too if I am kept hungry long enough.
Whenever I see snails I remember that we seem to have been somewhat obsessed with them a while ago and we still don't know why (see here).
And of course, I am wary of bunnies (see here).