Bird's Nest Fern, Amber Mountain, Madagascar
In Amber Mountain, the forest is full of these giant nest-like plants. The common name "Bird's Nest Fern" is confusing as it is used for the genus as well as multiple species. I assume that this is the Asplenium nidus species, which is documented to occur in Madagascar.
''Asplenium nidus'' is a species of fern in the family Aspleniaceae, native to tropical southeastern Asia, eastern Australia, Hawaii, Polynesia, Christmas Island, India, and eastern Africa. It is known by the common names bird's-nest fern or simply nest fern.