Imo, bigger is always better, as long as the bar spacing is appropriate for species. The smaller the bird, the smaller the space between the bars. Parakeets, no more than 5/8″ and tiels, no more than 3/4″
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Another on-line seller, Future Pets/Pet Expo, has excellent prices on cages. They have a limited selection compared to Fosters and Smith – but carry many of the same cages at much lower prices.
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I do have one recommendation. Get a heavy-duty. large, square or rectangular cage. The multi-level artsy cages and economy models are not the best construction. Plastic parts crack, chip, can be chewed, and hold bacteria. Theyre also b*tch to clean.
Small,plastic bottom cages should be used with caution. They can often be easily damaged, dropped, or knocked over.
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