The Kuala Lumpur Bird Park is in downtown Kuala Lumpur right next to the Museum of Islamic Art. They bill the park as the world's largest free flight walk in aviary.

If you like seeing birds and you have time in Kuala Lumpur I think the birdpark is worth a visit. But it really isn't so special and other things may be a more valuable use for your time. If you have time and want an outdoor activity though it is fine (for example if you are living in Kuala Lumpor or staying for an extended period). The park is a bit run down and it is a bit sad how small the enclosures are for some of the birds.