In winter when least crowded by tourists Rock Partridge can be found above the ruins on the hillsides, but you have to go up there to see them. With luck on the rock faces on the eastern side of the ancient ruins very easy Wallcreeper can be found. Western Rock Nuthatch are very common and breed in the ruins. Culturally a fantastic place to visit. You can day trip on an excusrion from Athens but that will unlikely yield the Rock Partridge as first light above the ruins when they are calling is the best way to find them. So a hirecar and staying locally for a few days is recommended.
Walking once parked. Some short but steep hike for the Rock Partridge
Terrain and HabitatScattered trees and bushes, Valley
ConditionsFlat, Hilly, Rocky, Dry, Dusty
Is a telescope useful?Can be useful
Good birding seasonSpring, Winter
Best time to visitWinter, Spring
RouteNarrow trail, Unpaved road
Difficulty walking trailStrenuous
Birdwatching hide / platformNo
I stated strenuous walk however within the ruins themselves the walking can be very easy. The least effort I have ever put in for a Wallcreeper near the Castalia Spring.
Mesolonghi Lagoons for eastern European lowland and wetland birds. Mount Parnassos in Spring and Summer, road was closed when we visited in winter.