What size cage should i get for zebra finches?

The height of the cage is not as vital as having room to fly horizontally, so a long but shorter cage is acceptable. While experts vary in their recommended minimum size, it a good idea to get the largest cage you can. 30 inches long, by 18 inches high and 18 inches wide is a good sized cage for a pair of zebra finches. Wire spacing should be 1/4 inch to 1/2 inch.