Bidia Classified Forest lies c.30 km north-east of Andilamena. The site is a network of mountains, peaking at Bidia (1,200 m), which is part of the Marovoalavo plateau. The hydrological network is dense and dominated by the Befiaka, Vakoanina and Bidia rivers. The primary vegetation is composed of mid-altitude, dense, humid evergreen forest (frequently 25–30 m high), dominated by trees of Weinmannia, Dalbergia, Canarium and Eugenia. There are also secondary formations of traveller’s palm Ravenala and fallow areas dominated by Solanum and Harungana.
See Box and Tables 2 and 3 for key species. Sixty-two species are known from the site, of which 33 are endemic to Madagascar. Species characteristic of both low- and mid-altitudes occur. Species of global conservation concern include Tachybaptus pelzelnii, Atelornis pittoides, Dromaeocercus brunneus, Randia pseudozosterops and Pseudobias wardi.
Non-bird biodiversity: 1>Lemurs: Varecia variegata variegata (EN), Indri indri (EN), Propithecus diadema diadema (EN). Carnivore: Cryptoprocta ferox (VU).
BirdLife International (2019) Important Bird Areas factsheet: Bidia Classified Forest. Downloaded from http://www.birdlife.org on 16/07/2019.