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. Buy a suitable cage for your Moluccan or Umbrella Cockatoo. The cage should be rectangular and roughly three feet by three feet by three feet (91cm by 91cm by 91cm), with plenty of space for your cockatoo to climb and flap his wings, and a bar spacing no more than half an inch (1.27cm). Many Moluccan and Umbrella Cockatoos are protective of their cages. 2  If this is true for your Cockatoo, it might be best to have your 'Too step up onto a wooden stick. 3  Then, when out of sight of the cage, have your Cockatoo step up onto your arm. 4  Birds poop frequently!