It's a five-stage process for the birds to open the bin lid, according to the study. That's why the Sydney sulphur-crested cockatoos, a highly social parrot common across East Coast cities, provided a rare opportunity. The study found that sulphur-crested cockatoos in Sydney learned from each other to lift rubbish bin lids for food. The research team launched an online survey asking Sydney residents if they had seen cockatoos lifting trash bin lids for food. But "it's easy for an ibis to see food in a bin, and get food out of it," said Major.

Source: CNN July 22, 2021 19:41 UTC