Higher resolution available at https://zacklabe.com/global-sea-ice-extent-conc/ 🧪
Not all Neolithic cave paintings are of land animals. Here is a >20,000-year-old fish painting from the Cueva de la Pileta near Málaga, Spain which is thought to be based on an Atlantic Halibut.
https://en.wikipedia.org/wiki/Cueva_de_la_Pileta