The Dog and the Wolf thy maintenance and thy fodder and let me not see thy riding"." Since the onager is an Asian animal, it suggests that this region may have been the origin of the alternative fable recorded as 183 in the Perry Index. In this the wild ass at first congratulates a grazing pack-animal's sleek condition but eventually is grateful for his own freedom after seeing the other being driven along beneath a load. A later 'Christianised' version is now numbered as the independent fable 411 in the Perry Index. There the onager jeers at a donkey, only to be eaten by a
Animal communication individual. The altered signal provides information that can indicate food, predators or conspecifics. Because the sender and receiver are the same animal, selection pressure maximizes signal efficacy, i.e. the degree to which an emitted signal is correctly identified by a receiver despite propagation distortion and noise. There are two types of autocommunication. The first is active electrolocation found in the electric fish Gymnotiformes (knifefishes) and Mormyridae (elephantfish) and also in the platypus ("Ornithorhynchus anatinus"). The second type of autocommunication is echolocation, found in bats and toothed whales. There are many functions of animal communication. However, some have been studied in