Ordinary chickens have at least 25 different calls and they use them in some language-like ways. Not only do they communicate directly with each other, but they consider what they are about to say and can even tell lies. When a rooster finds some food, he sometimes makes a "took took took" sound. The "took took" call is repeated much more when there is a hen nearby. Hearing the call, the hen usually strolls over to the male, who may offer her choice morsels from his own beak. Hens who hear "took took" also peer down at the ground, as if looking for food. But sometimes a rooster will say "took took" when there's no food just to get the female to come over. It appears that at least some chicken calls are more than just reflex reactions, since they change depending on whether others are listening and are sometimes used for deception. Read about the intelligence of chickens: http://soma.npa.uiuc.edu/~mmaciver/chicken_smart.html Lizards also communicate in complex ways: http://features.LearningKingdom.com/fact/archive/1999/08/23.html