Utoyo L, Marthy W, Noske RA, Surahmat F. Nesting cycle and nest tree characteristics of the Helmeted Hornbill <em>Rhinoplax vigil</em>, compared to the Wreathed Hornbill <em>Rhyticeros undulatus</em>, in Sumatran lowland rainforest. KUKILA [Internet]. 2017Jun.17 [cited 2024Apr.19];200:12-. Available from: https://kukila.org/index.php/KKL/article/view/516