The article that I'm reading claims that boy chimps like to play with toy trucks: https://www.nationalgeographic.com/travel/article/101220-chimpanzees-play-natu

The article that I'm reading claims that boy chimps like to play with toy trucks: https://www.nationalgeographic.com/travel/article/101220-chimpanzees-play-nature-nurture-science-animals-evolution https://www.nationalgeographic.com/travel/article/101220-chi... You're gonna therefore have to explain to me why you think this is natural behaviour. Since, as I understand, trucks were invented by humans. Isn't it just that chimpanzees are social and have been cued by human expectations, their captors and immediate relatives?