Horizontal datums are used for describing a point on the earth 's surface, in latitude and longitude or another coordinate system. Vertical datums measure elevations or depths. In engineering and drafting, a datum is a reference point, surface, or axis on an object against which measurements are made.orizontal datums are used for describing a point on the earth 's surface, in latitude and longitude or another coordinate system. Vertical datums measure elevations or depths. In engineering and drafting, a datum is a reference point, surface, or axis on an object against which measurements are made.
There are 25 known species of pythons in the world. Like all snakes, pythons are cold blooded. Pythons are not venomous; they kill their prey by constriction. Some of the different types of pythons are the reticulated python, the ball python, the Burmese python, the green tree python, and the carpet python. While some of these species should not be held captive by a non-professional, other types of pythons can make good pets.
Large Snake Species. There are more than 2,500 species of snakes, from the tiny thread snake, which grows to less than 4 inches, to the mighty anaconda. Types of large snakes typically sold as pets include ball pythons, boa constrictors and Burmese pythons. If you're considering a large snake as a pet, there are a few things to consider because snake-keeping isn't simple, nor is it for the faint of heart. Large snakes usually require live prey, though some will tolerate dead animals. Unless you enjoy watching rats being eaten alive (or dead), a snake may not be the right pet for you.