Yes, they walk down.....sometimes very slowly, like a big elephant taking it's time.Do they actually walk down the ramp? Mine fly down, at least from what I have been able to observe.
I should probably move mine lower.......
The younger birds that aren't as hefty yet, still fly/jump down.
Your cleats may be too far apart...mine are about 6 inches apart, they don't like sliding on their feet much.
