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Message: <blockquote data-quote="jurek" data-source="post: 3070710" data-attributes="member: 3357">During my short visit in Principe in 2013 we heard similar sound at dusk in the forest along the road going to Bom Bom resort. It it turned to be the local Glossy Starling which makes varied calls. At sunset it made similar series of short hooting sounds, not connected to its typical babble. BTW, at night on Sao Tome we heard several weird, high-pitched "kra-ka-kra-ka" sounds coming from the forest canopy, and wondered if it were frogs or maybe some birds (Madeiran Storm-Petrel?). I think frogs were more probable.</blockquote>