Biotropica. 2019;00:1–11. wileyonlinelibrary.com/journal/btp | 1 © 2019 The Association for Tropical Biology and Conservation 1 | INTRODUCTION Plant–pollinator interactions are one of the most critical rela‐ tionships maintaining ecosystem function (Ollerton, Winfree & Tarrant, 2011), and our understanding of them has benefited considerably from network analyses (Watts, Dormann, Martín González & Ollerton, 2016). However, not all networks have been studied to the same extent. In a recent review, Vizentin‐ Bugoni et al. (2018) quantify the proportion of pollination net‐ work studies from tropical, relative to temperate, locales and point out that within the tropics, studies from Africa are es‐ pecially scarce. In terms of nectivorous pollination networks, Africa is again understudied (Zanata et al., 2017). They list eight Received: 3 December 2018 | Revised: 25 March 2019 | Accepted: 10 April 2019 DOI: 10.1111/btp.12669 ORIGINAL ARTICLE Promiscuous pollinators—Evidence from an Afromontane sunbird–plant pollen transport network Charles A. Nsor 1,2 | William Godsoe 3 | Hazel M. Chapman 2,4,5 *Nsor and Chapman are Joint first authors. 1 Department of Biology, Gombe State University, Tudun Wada, Nigeria 2 Nigerian Montane Forest Project, Taraba State, Nigeria 3 Bioprotection Centre, Lincoln University, Lincoln, New Zealand 4 School of Biology, University of Canterbury, Canterbury, New Zealand 5 School of Biological Sciences, University of Canterbury, Christchurch, New Zealand Correspondence Hazel M. Chapman, School of Biological Sciences, University of Canterbury, PB 4800, Christchurch, New Zealand. Email: hazel.chapman@canterbury.ac.nz Abstract Sunbirds play a major role in the pollination of Old World nectivorous plants. However, with the exception of the Cape Floristic Region there is a major knowl‐ edge gap around African nectivore interaction networks—a stark contrast from the abundance of neotropical hummingbird–plant networks. Here, we describe a sunbird pollen transfer network (PTN) which we use in conjunction with a sunbird flower visitation network (FVN) to explore levels of sunbird specialization within an Afromontane forest habitat. Both networks were generalized compared with similar‐ sized hummingbird networks, reflecting the wide range of flower types visited, the generalist diet, and bill characteristics of sunbirds. Three sunbird species from the genus Cinnyris accounted for 85% of flower visits and 77% of all pollen transported. Of the 17 plant species across both networks, 15 are predominantly pollinated by in‐ sects while Anthonotha noldeae (Fabaceae–Caesalpinioideae) and Globimetula braunii (Loranthaceae) depend on sunbirds for seed set. Sunbird species average bill lengths varied between 14.5 mm (the variable sunbird) and 23.6 mm (the Green‐headed Sunbird), but, while more pollen was carried on longer bills, we found no evidence for a relationship between bill length and type of flower visited. Both networks were nested. Some specialization was observed in both networks although this does not appear to be driven much by sunbird–flower trait matching. Overall, our results sug‐ gest that in contrast to nectivores elsewhere, factors such as phenology and/or en‐ vironment, rather than morphology, may play important roles in limiting potential sunbird–flower interactions and need further investigation. KEYWORDS flower visitation, generalist pollinators, Ngel Nyaki, Nigeria, pollination mutualism, specialization Associate Editor: Emilio Bruna Handling Editor: Carlos Garcia‐Robledo