No. You can not physically sex them. They have to be DNA'd tested.
Minimum Size 20"x20"x24" Maximum Size 36"x36"x36"
About 3 times the size of the parrot.
medium size cage for comfort
Well, it'd have to be a pretty big cage for 2 big parrots. It depends if the species are compatible with each other and one isn't more aggressive than the other, they're about the same size, and the cage is pretty big so they don't fight over territory. If I were in that situation, though, I'd just buy another cage for the other parrot.
100 budgies aren't going to need a cage, they're going to need an aviary.
It depends on the size of the snake. It should have a cage at least the length of the snake.
For two guinea pigs you need at least 7.5 feet of cage.
About 3 times the size of the parrot.
it would need around 6-8 foot cage
it depends on which kind of parrot they come in all sizes
Parrots reproduce by laying eggs, their clutches vary in size depending on the species of parrot.