LANGUAGE UNIVERSALS
The way we are using the word grammar differs in its most coming meaning. In other words, grammar includes everything that speakers know about their language. The sound system is called phonology. The system of meaning; semantics. The rules of word formation; morphology. The rules of sentence formation; syntax. The vocabulary of words; lexicon.
To discover the nature of universal grammar whose principles characterize all human languages is a major aim of linguistic theory. The linguist`s goal is to discover the laws of human language as the physicist`s goal is to discover the laws of the physical universe. However, the linguistic theory of universal grammar develops, and new discoveries shed new light on what human language is
SIGN LANGUAGE
Sign language is visual gestural systems that use hand and body gestures as the forms used to represent words

ANIMAL LANGUAGE
The squeaking of birds or the dancing of bees represents system similar to human language. If animals' communication systems are not like human language, it will not be due to a lack of speech.
On the contrary, when animals vocally imitate the human's utterances, it does not mean they possess language. Language is a system that relates sounds or gestures to meaning. Talking birds such as parrots capable of reproducing words and phrases of human language that they have heard. In fact, parrots can say "hello" or "goodbye" regardless of weather people are arriving or departing. In other words, the bird's utterance has no meaning .

THE BIRDS AND THE BEES
Most animals possess a signaling communication system. Among spiders there is a complex system for courtship. The male spider, before he approaches his lady love, goes through a series of gestures to inform her that he is no a fly to be eaten!!!. These gestures are not changing.
Besides. The calls and songs of many species birds do have a communicative system. They resemble human language in there is a dialects within the same language. Bird calls which consist of short notes convey message to the immediate environment such as danger, feeding, flocking and so on. Bird songs which consist of complex pattern of notes are usually used to attract mates. There is no evidence of any internal structure to these songs, nor can they be detailed into independently meaningful meaning as word of human language can be.

What We Know About Language
1: Wherever humans exist, language exists
2: there is no primitive language, all languages are equally complex and capable of expressing any idea in the universe. The vocabulary of any languages can be expended to include new words of new concept
3: All languages change through time
4: The relationship between sounds and meanings of spoken language and between the gestures and meanings of sign language are for the most part arbitrary
5: All grammars contain rules for the formation of words and sentences of similar kind
6:"important" There are semantic universals such as "male "or "female."Animal" or" human' found in any language in the world.
7: Every language has a way of referring to past time, negating, commands, forming questions, and so on
8: "very important" any normal child born in anywhere in the world of any racial, geographical, or economic heritage is capable to learn the language that he or she is exposed. The difference among languages can not be due to biological reasons