On certain occasions of life, people should make use of certain tools that serve as a medium container to be able to count with the presence of certain animals that can very easily escape, i.e. are not exactly pets, therefore require the presence of a useful means for maintaining them inside a place for various conditions and such specific means are cages, which in its different presentations give scope to be able to maintain the presence of animal that you want to have as a company or as a sample of something special, that it can be created in the cage it closest to a pleasant atmosphere to the animal. The main feature that accompanies the cages, is that these are presented in closed, as if it were a box, which should fulfil the function of maintaining that it serves as input and output of the animals that were put in cages, while the rest of the structure that composes the cages are bars which are presented with a considerable amount of rodsi.e. walls, and in some cases the floor and ceiling of the cages are a lattice, which depending on the animal that will be inside the cages, such lattice will be of a material in specific, according to criteria of safety or comfort. As mentioned before, material used in the cages as gratings depends heavily on the animal to be introduced within the cages, in such a way for birds which is one of the animals that more be put in cages, it is customary to make use of any metal cages in some not very thick rodsHowever it is also very common to find some cages a little more suitable for birds such as those made of wood or Wicker, which offer better conditions for the life of the birds, the problem that occurs with these, is that wood can go deteriorate when exposed to moisture and sunlight, in addition to the waste of the same birds. There are other cages, which are mainly used for certain animals which by their fierce conditions, must be within much more resistant cages, as occurs with some dogs that they put in cages a very sturdy plastic or metal or in cases of zoos and other activities, large cages with bars of metal very resistant and very thick rods, are used as it can happen with Lions, apes and some other animals. Something to keep in mind with the cages, is that they are also useful as means of transport, since on many occasions pets want to carry along with the master in the realization of a journey, but by certain conditions should go in some compartments special, because they cannot be with their masters in the course of the trip, therefore should be in a special type of cages for transport in public media such as aircrafttrains and buses.