Small bird cages are not necessarily for small species such as Canaries and Finches. Often times the smaller birds are more active and require more room. Be sure to talk to your vet about the best cage for your pet bird. Small bird cages do have great benefits as these light weight cages are easy to transport and can fit is most areas of your home. These cages are not suitable for large birds or birds that like to fly or climb and as a general rule if your bird can flap it wings and touch the side or a toy, your cage is not big enough.