How do you get Klepto The Condor and the 4th star in Tiny-Huge Island on Super Mario 64 ds?

To get Klepto The Condor and the 4th star on Tiny-Huge Island in Super Mario 64 DS, you must first make your way to the top of the tallest mountain using Yoshi. Once you reach the top, ground pound on the wooden sign post located on the cliffside. This will cause a large egg to fall from the peak of the mountain; when it hatches, Klepto The Condor will appear and steal your cap.

Pursue the condor as it flies around various locations of Tiny-Huge Island, including the starting area, mountain, tree area, and beach. Use Yoshi's speed to catch up to it. When you get close enough, dive from Yoshi's back with a ground pound to stun Klepto The Condor and recover your red Mario hat.

After retrieving your cap, jump on Klepto The Condor's back and stay there. This will prevent it from flying away again and allow you to reach the large, hidden area on top of the mountain. Here, you'll find the fourth star. Simply grab the star to complete the mission and add this star to your collection.