I just tried to inform myself but I found the same results. Again...
"The performance of young children on the ‘mirror self-recognition test’ varies hugely across cultures, a new study has shown. This is the test that involves surreptitiously putting a mark on a child’s forehead and then seeing how they react when presented with their mirror image. Attempts by the child to touch or remove the mark are taken as a sign that he or she recognises themselves in the mirror. Studies in the West suggest that around half of all 18-month-olds pass the test, rising to 70 per cent by 24 months.
Chimps, orangutans, dolphins and elephants have also been shown to pass the test, and there’s recent debate over whether monkeys can too.
Tanya Broesch and her colleagues began by taking a simplified version of the mirror self-recognition test to Kenya, where they administered it to 82 children aged between 18 to 72 months. This version of the test involved a small, yellow post-it note rather than a red splodge, and children weren’t given the usual verbal prompts such as ‘who’s that in the mirror?’. Amazingly, just two of the children ‘passed’ the test by touching or removing the post-it note. The other eighty children ‘froze’ when they saw their reflection – that is they stared at themselves but didn’t react to the post-it note.
Next, Broesch and her team took their test to Fiji, Saint Lucia, Grenada, Peru, Canada and the USA, where they tested 133 children aged between 36 to 55 months. The performance of the North American children was in line with past research, with 88 per cent of the US kids and 77 per cent of the Canadians ‘passing’ the test. Rates of passing in Saint Lucia (58 per cent), Peru (52 per cent) and Grenada (51 per cent) were significantly lower. In Fiji, none of the children ‘passed’ the test."
Cross-cultural reflections on the mirror self-recognition test