It certainly looks like Chloris chloris. Always remember ZTL is never fully trustworthy as someone could have easily not seen the species during a visit and put it in former holdings
What exhibit it is - probably the Siberian wooden cottage near Amur tigers? In that case - this aviary was reconstructed and re-opened very recently (few weeks ago). I´ve not been in the zoo since but another visitor wrote he saw only Czech native species there. I vote for European greenfinch too.
Plzen is undergoing large change in its bird collection (probably mostly due to recent change of curator), good number of bird species move in and out without any public announcements and some of them are real rarities. ZTL currently is limping behind, zoo´s signage also can´t keep the pace. We must wait till summer when newest yearbook is out, more zoochatters visit and update ZTL and the collection itself settles down a bit.
Here you can see a big difference with Prague zoo - its registrator is also ZTL member and keeps it always perfectly up-to-date in his free time. I never do any changes myself - unless I add some detailed old records based on reliable sources (literature, old photos etc.) or delete obvious errors done by some maverick.
@Jana This photo is from November 2023, I believe that particularly aviary was closed at the time. This bird was housed outside the tropical house near some crossbills and nutcrackers if i remember correctly.
Thanks to the info regarding ZTL, for most everything else it was pretty reliable especially considering the size of the collection.
