The female is duller in colour with a black crown, olive-brown upper parts and yellowish underparts streaked with olive green.

[2] Before making such a call, an individual must take a sharp inhale to increase air pressure in the interclavicular air-sacs surrounding its syrinx.

[1][4] Despite its vulnerable status, a juvenile male has been photographed in 2007 foraging in one of the campuses of the Federal University of Rio de Janeiro, an unusual urban setting located on an artificial island in the vicinity of the heavily polluted Guanabara Bay.

[3] As a frugivory species, P. nudicollis disperses seeds for the plants it consumes in the Atlantic rainforest ecosystem, such as the Euterpe edulis.

[7] It consumes fruits from plants of the Arecaceae, Myrtaceae, Myrcinaceae, Moraceae, Myristicaceae, Apocynaceae, Sapindaceae, Lauraceae, Leguminosae, Burseraceae, Malpighiaceae, Celastraceae, Elaeocarpaceae, Araliaceae and Liliaceae families.

[3] Although adult members of the bellbird species have only been observed eating fruit, snails have also been recorded in the stomach of a P. nudicollis specimen of unknown sex.

P. nudicollis has been found in the Paraguayan protected area of Reserva Natural del Bosque Mbaracayú, around which it is featured in high school student outreach campaigns.

[3] Trapping pressure has been most significant in Brazil's southern Bahia, São Paulo and Santa Catarina, as well as in Paraguay for sale in its capital city of Asunción.