Basic natural history and behavioural data are lacking for the majority of broadbills and pittas (Eurylaimidae, Calyptomenidae and Pittidae). We present a series of observations on these birds made during two visits to Tawau Hills Park, Sabah, Malaysia. During this period, we detected changes in temporal presence, detectability or vocal behaviour in various species. We also found habitat overlap on one ridgeline among four species of pitta. We observed a Green Broadbill Calyptomena viridis respond to our imitation of a call with a wing display. We discuss the social behaviour of Black-and-yellow Eurylaimus ochromalus and Banded Broadbills E. javanicus, including wing displays, territoriality, and in the first-named species, social groups comprising multiple adults. We also describe various nesting behaviours in these two species, including nest-construction techniques, incubation behaviour, nest defence, and the first described Banded Broadbill nest on Borneo. We found Dusky Broadbills Corydon sumatranus to frequently be the most conspicuous members of mixed-species flocks otherwise dominated by Cuculidae and Picidae. We analysed Black-crowned Pitta Erythropitta ussheri home range size and density in a colour-banded population, and found a potential hybrid or backcross with Garnet Pitta E. granatina. We observed that Blue-banded Pitta E. arquata make non-vocal sonations by striking their closed wings on their flanks, and discuss the immature male plumage of Blue-headed Pitta Hydrornis baudii.
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