"While incubating their egg, the condors would switch nest-sitting duties every 3 to 4 days but now they are switching almost every day," Zion National Park explained. "Recent behavior changes from these condors have given park biologists reason to believe the egg has hatched."
A new California condor chick would be a big deal for these birds. In the early 1980s, because of lead poisoning and other threats, the population of California condors dropped down to a population of just 22 — in the whole world. Thankfully, because so many people worked hard to save them, their population is back up to around 500.
But park biologists needed to make sure that they had a new chick to celebrate — they had to see the baby with their own eyes. In those canyons, that means basically dangling off the side of a cliff. So that's just what they did.