むかしとかげでしょう
昔蜥蜴でしょう
mukashi tokagedeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of むかしとかげ

1. Probably a lizard.; It was likely a lizard.

Polite
Presumptive
Conjecture
Usually Written in Kana