Even the common _Limnaea stagnalis_, which is usually regarded as strictly herbivorous, will sometimes betake itself, apparently by preference, to a diet of flesh. Karl Semper frequently observed the Limnaeae in his aquarium suddenly attack healthy living specimens of the common large water newt (_Triton taeniatus_), overcome them, and devour them, although there was plenty of their favourite vegetable food growing within easy reach.[66] The same species has also been noticed to devour its own ova, and the larvae of _Dytiscus_. _Limnaea peregra_ has been detected capturing and partially devouring minnows in an aquarium, when deprived of other food, and Dr. Jeffreys has seen the same species attack its own relatives under similar circumstances, piercing the spire at its thinnest point near to the apex.[67] _L. stagnalis_, kept in an aquarium, has succeeded in overpowering and partially devouring healthy specimens of the common stickleback.[68] =Powers of Intelligence, Homing, and finding Food.=--It is not easy to discover whether land Mollusca possess any faculties which correspond to what we call intelligence, as distinct from their capacities for smell, sight, taste, and hearing. Darwin mentions[69] a remarkable case, communicated to him by Mr. Lonsdale. A couple of _Helix pomatia_, one of which was sickly, were placed in a small and ill-provided garden. The stronger of the two soon disappeared over the wall into the next garden, which was well furnished with food. It was concluded that the snail had deserted its weakly mate, but after twenty-four hours it returned, and apparently communicated the results of its expedition, for after a short time both started off along the same track, and disappeared over the wall. According to Dr. W. H. Dall,[70] a young girl who possessed a remarkable power over animals succeeded in training a snail (_H. albolabris_) to come out of its lurking-place at her call. If placed in a room, it would shrink into its shell at the sound of any other voice, but it would always start off in the direction of hers.