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.
Females don't sing and cost $40-$95. Canaries with unusual colors or that sing particular well can run up to $190. Also singers, finches have bright colors that nearly span the rainbow including yellow, green, brown and red. The more common colored species cost $10-$35. Parakeets are brightly colored members of the parrot family with red, green, blue, orange, yellow or purple feathers. They interact well with people, are natural acrobats and live around 10 years. Prices start around $20, but brilliant-colored parakeets can run to $275.