As the species name alludes, its closest relative is almost certainly the African Fish-eagle, Haliaeetus vocifer. Together, they form a distinct lineage of sea-eagles, which separated soon after the genus' divergence; they retain the ancestral dark beak, talon, and eye colors, but as opposed to other Haliaeetus species, their tails are always at least partially white even in juveniles. Like in other sea-eagle species pairs, one species (the Madagascar Fish-eagle in this case) has a tan head, while the other has a white one.
This species is endemic to Madagascar, where it survives in low numbers along the west coast. Surveys between 1991 and 1995 recorded at least 222 adults from 105 sites, with an estimated 99 breeding pairs. The main threats to its breeding habitat are deforestation, soil erosion and the development of wetland areas for rice-paddies. It is also in direct competition with humans for fish stocks.
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