Mars: Hellas Planitia. The largest visible impact crater in the Solar System is Hellas Planitia on Mars, a giant depression with a floor over seven kilometres (4.3 miles) below the Martian surface.
Dimensions. The recommended size for one parakeet is 25 inches tall and 25 inches deep. To house two birds comfortably, you should double that cage size to make it at least 50 inches tall and 50 inches deep.If you can afford it and have enough space, opt for a bigger cage.all cages work best for parakeets. This type of bird really likes to fly around and hop from place to place. If you can, choose a cage that exceeds the height recommendation of 50 inches.
Tips for a Cockatiel Bird Cage-Cockatiels fall inbetween a small and medium parrot, bar spacing between 1/2 to 5/8 is best.Be sure it does not exceed 3/4 - They like to socialize with their owner so consider a high visibility area of your home.- They are active so room for lots of toys is good.s a guideline, shop for a bird cage that is a minimum of 20 inches wide, 20 inches deep, and 24 inches height. Virtually any medium sized stand-up cage will work well for cockatiels.