Tree resin you can get ahold of on accident, light a green piece of wood on fire, you get glue. Animal products can turn to glue with again just leaving it in a fire a long time or a hot enough fire. Humans have been making stone and other tools a lot longer than Homo Sapiens have been around.
I’m pretty sure we had glue before we were even our current species.
Like what? Spit? Poop? Semen?
Tree resin you can get ahold of on accident, light a green piece of wood on fire, you get glue. Animal products can turn to glue with again just leaving it in a fire a long time or a hot enough fire. Humans have been making stone and other tools a lot longer than Homo Sapiens have been around.