Horses' gums recede with age, leading to longer teeth. A common way to inspect a horse's worth is to check it's mouth, hence the phrase. Receiving a horse as a gift and immediately inspecting its value was considered offensive, much like inquiring about the worth of a present today is rude.
Poetry is the first major literary genre. All types of poetry share specific characteristics. In fact, poetry is a form of text that follows a meter and rhythm with each lines and syllables. It is further subdivided into different genres such an epic poem, narrative, romantic, dramatic, and lyric.
Narrative Poetry. Narrative poetry is a form of poetry which tells a story, often making use of the voices of a narrator and characters as well; the entire story is usually written in metered verse. The poems that make up this genre may be short or long, and the story it relates to may be complex.