For a cockatiel, the minimum recommendation cage size is 20 inch wide, 20 inch deep and 28 inch high.
Really depends on the size of the bird. I think 25x15x30, or measurements close to that should be sufficient.
The width is more important than the heighth. Be sure to select a cage that is AT LEAST wide enough to allow your Tiel to spread her wings.
pretty big , cause even if its small it still grows up to be big
the size of your cockatiels cage should be like 30 inches big
Cockatiel cages should be no smaller than 18x18x24. The bigger the cage, the better but be sure to keep in mind the spacing of the bars in contrast with the size of your Cockatiel.
to spread there wings often when they don't get to fly around or don't have a big enough cage.
Cockatiels are very territorial and are okay either by themselves or one other but I don't know about seven. For one cockatiel you at least need a cage were it can stretch out it's wings and fly around in so for seven, get an aviary cage.
Cockatiels do not need anything to have a mate. Just put him/her in the cage with your cockatiel, however, if you want them to mate, they will not mate if you do not have a nesting box. In order to breed cockatiels, you will need a nesting box.
About as big as a great danes cage i would say
8.5ft
Really depends on how big the bird is / how big it will get. The bigger the bird, the bigger the cage you will need. I would recommend getting at least a 20Lx20Wx29H sized cage for a parrot.
you would probably need a medium sized cage for a male rat as they are quite big. but you could get a cage with a few ladders and and a exercise wheel to keep it active.
you shouldn't cage dolphins dolphins need relaxing environments, also if you picked out a normal cage like a dog cage it (obviously) wouldn't keep water in
yes you can. cockatiels enjoy human company as well as cockatiels or other birds company as well as the voice of other birds, just make sure that the cage you keep them in is big enough and doesn't crowd them--------------------------------------------------each cockatiel is different and males / females react different. try putting the cages close to first see if one gets aggressive. i had times where they would attack each other badly due to territory dominance.
Cockatiels eat paper to keep themselves entertained. Usually they don't actually eat it, they just tear it up and chew on it. If you are uncomfortable with your cockatiels eating paper, you can try to distract them from the habit. Putting more toys in the cage might help.
No it's fine to feed cockatiels in their cage. I feed mine in their cage as they will not eat out of my hand. Just make sure you clean their cage thoroughly every day, including perches, dishes, toys etc. Also make sure your birds have vegetables and fruit to eat aswell as seeds or pellets to keep them healthy.
Cockatiels need constant attention, so you need to make sure that you are home enough to spend time with them. When playing without them, make it in 10-15 min increments and get them out many times a day. Also they need a large cage to fly around in with different types of perches. Make sure your house is between 65-80 degrees. Also it is best if you do not have cats.