Perch basics...

Here's a fun little clip from the Long Island Parrot Society reviewing some perch basics:

Perfect perching begins with a perch that's the right diameter for your bird's feet. A variety of perching surfaces is optimal-wood, concrete blend, rope and other safe materials. Take a look at the rope perch here---it's time to replace a rope perch when it becomes soiled or heavily frayed as you see here. Birds can become entangled in a tangled mess like this! Cracker worked doggedly to destroy her perch. It took several weeks to get to this point. The perch has since been removed. A nice perching option is a swing, like the circular one you see with Bobo, the African grey

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