other things humans have done
eat poison plants, decide they like getting poisoned, and evolve the plants to poison them more
evolve to not have hair, but they find mammals with thick fluffy hair and put the hair on themselves, and evolve the mammals to produce extra hair so they can both have a warm coat of hair
split up their parasitic lice species into two separate species because they start taking other animals' hair and putting it on themselves so much
learn how to set things on fire on purpose. maintain body temperature by just standing beside some wood that's on fire instead of literally any normal option
figure out that their prey tastes better and is easier to digest when they hold it over a fire after killing it. get smarter because they digest food so good after it's been held over a fire.
find a poisonous plant and try washing it in boiling water until they don't die when they eat it anymore
go across the ocean by making a floating nest despite not being able to breathe underwater, drink ocean water, or even swim naturally
drink milk from other mammals even though they can't digest it and it makes them sick. Evolve those mammals to produce more milk than their babies can drink so they can drink the milk. Some members of the species evolve to be able to digest milk because they were so hellbent on drinking it.
find flowers, bugs and minerals that are nice colors and crush them up to try to turn other things that color
eat mushrooms that make their nervous systems malfunction because they like malfunctioning their nervous systems