**The YouTube transcript details the interactions between ancient Greco-Roman civilizations and several now-extinct animal species.** **It highlights the aurochs (wild ancestor of cattle), European lions, Barbary lions, Caspian tigers, dwarf elephants of Tilos, North African elephants, and the Arabian ostrich.** **The text describes how these animals were encountered through hunting, warfare, gladiatorial games, and simple coexistence.** **It explains the role humans played in the eventual extinction of many of these creatures, often through over-hunting, habitat destruction, or exploitation in entertainment.** **Additionally, the video transcript promotes a news app, Ground News, which aims to provide objective reporting by revealing the political leanings and reliability of different news sources.**