One of the most famous defenders of the Amazon rainforest, indigenous chief Raoni Metuktire, has been hospitalized with Covid-19 but is “well and stable,” the institute he founded said Monday.

The latest health scare for the 90-year-old chief came just over a month after he was released from the hospital for gastric ulcers and a series of other issues.

Known for his colorful feather headdresses and the large disc inserted in his lower lip, Raoni, a chief of the Kayapo people in north-central Brazil, has traveled the world raising awareness of the threat posed by destruction of the world’s biggest rainforest.