I am a Capricorn. One of the most irritating things about being a Capricorn is that most astrologers portray us as mountain climbing land goats. This image encourages them to wax poetic about how we are able to scale great obstacles, have strong footholds, etc etc. In fact our sign is represented by a sea goat. This is from an astrology web site: "Capricornus the sea goat is in the area of sky that the ancients called the Sea. It has changed very little over the ages. The figure has the head of a goat and the tail of a fish."
Here is a wonderful drawing of the sea goat.
The constellation Capricornus was considered to be the "Gateway of the Gods" through which the souls of men passed after death.
Some people see Biblical symbolism in the split nature of the Goat's body: the sacrificial goat as the head, the fish tail a symbol of Christ. To me the sea goat symbolizes transformation, movement from one state to another, dual existence.