Assuming that you have a tiger salamandar (regular/common salamandar) You need a cage that will be big enough for dirt, A dish of water, plants, bark. Salamandars produce quite a bit of waste so you need to keep in mind that if you want a healthy salamandar then you will have to clean it frequently. There is no exact measurement I can give you, because It's your descision about your cage. I guess you can find a nice medium size and still keep in mind those things I stated.
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
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I wouldn't put them together. They might attack eachother.
You can measure it.
You need the scuba gear from the photo guy and go diving. The cage is down there.
At first I thought that it was just a big newt but then I discovered that it was actually a salamander.
If it is a frog that is a natural inhabitant of the area, you need to let it be free.
1.8 meters