"Mammoths Are Not Extinct Yet!" is a 2023 installment of the Czech Streets
Here's a general article on mammoths:
In certain European and internet subcultures, calling someone a "mammoth" can be slang for someone who is large, old-fashioned, or incredibly stubborn and resilient. czech streets 149 mammoths are not extinct yet link
On any given Czech street, the phrase may be erased or repainted, photographed or ignored. That ephemeral fate is part of its life. In a city where layers are constantly being applied and stripped away, the mammoths live or die by the attention of those who walk past. Their survival, implied by the slogan, depends not on biology but on imagination. In insisting that they are “not extinct yet,” the words themselves keep a species alive—an act of civic, poetic resurrection. Review: Czech Streets - 149 Mammoths Are Not Extinct Yet