The Unisphere eyasses are probably only a few days to a week away from fledging. They are very active most of the day despite the heat. They take turns practicing their hopping and flapping skills from the top of the mountain (top of the nest). Bobby and Cathy leave them alone more now, but are always nearby to protect their offspring.
Getting Ready For Takeoff
Eyass Siblings Watch Cathy Defend Territory Against Vulture
The Offending Vulture
Cathy In The Background, Watching Over Her Eyasses