In addition to sounds，facial expressions are also used by animals to communicate.For example，when dogs are angry，they show their teeth barking and raise their ears.On the other hand，when they’re frightened，they pull their ears behind with the mouth open.For another example，when the parent bird brings food for the offspring，the “begging expression” can be observed on its face.

　　Next，gestures and body movements are also common in animals.Honey bees are the most enthusiastic creatures on the earth because they dance to communicate.Some bees dance in the hive so that other bees get signals about the location of the honey comb.In addition，a deer waves its tail to warn others of some danger coming closer.Gorillas stick their tongue out to express anger.

　　Moreover，many animals communicate with each other through smell.They release pheromones(信息素) to convey messages to other animals.Wolves，deer and insects generally，use this type of communication.Even amoebas(变形虫) need to communicate and does it by chemical discharge.The animals use this type of communication to attract others for reproduction.Therefore，communication is so important that it’s useful in the process of reproduction.

　　Besides the above，animals like chimpanzees express feeling by touching each others’ hands.A newcomer puts its hand in the mouth of the head monkey to confirm its entry in their community.The head monkey gives the visitor the assurance of safety and goodwill.They even give hugs and kisses to express love.And cats snuggle(偎依) to show affection.

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