An Indonesian nature conservation agency (BKSDA) officer displays 16 heads of helmeted hornbills confiscated from illegal animal traders in Banda Aceh on July 26, 2019. /VCG Photo

The helmeted hornbill, with a distinctive helmet-like protuberance on its head, is listed as a critically endangered species on the IUCN Red List. /VCG Photo

Its precipitous decline is driven by demand for their heads, which are highly prized in East Asia. /VCG Photo

The BKSDA and Indonesian police jailed two illegal animal traders who were caught in a district near Mount Leuser National Park. /VCG Photo