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.
3. Donât make the cage too small. Cockatoos need room to roam and while they definitely prefer to be outside of their cage they can be comfy in their cage too, if it fits them. 4. Do choose a cage that is large enough to accommodate your companion. The minimum cage size should be at least 3 ft. x 2.5 ft. x 3 ft. high. 5. Donât buy a round or ornamental cage for your Umbrella Cockatoo. They will be unhappy in a pretty little cage, guaranteed! 6. Do choose a rectangular cage. Your Cockatoo will explore up and if the cage is round then it will be tapered at the top. This will limit your birdâs ability to explore. A rectangle cage with a dome top is okay too. 7.