Exploitation of underground bee nests by three sympatric consumers in Loango National Park, Gabon

Abstract

AbstractHoney represents a highly nutritious resource for animals, but is difficult to obtain given bees' defensive strategies. We investigated exploitation of the underground nests of stingless bees (Meliplebeia lendliana) by three sympatric consumers in Loango National Park, Gabon: the central African chimpanzee (Pan troglodytes troglodytes), forest elephant (Loxodonta cyclotis) and honey badger (Mellivora capensis). Given the differences in their respective morphological traits and sensory abilities, we hypothesized that chimpanzees would be more limited in digging out the bee nests, compared to the other two competitors, and would show behavioral strategies to overcome such constraints. Our dataset comprised camera trap footage recorded over 60 mo at 100 different bee nests. Chimpanzees visited the nests more often than the other consumers, showing a frequency of extraction success comparable to that observed in honey badgers, the most efficient digger. Both chimpanzees and honey badgers increased their extractive attempts across the dry season, whereas elephants did not. The soil hardness was greater during the dry season than the wet season and, possibly in order to compensate for this, chimpanzees showed a tendency toward digging at nests found in relatively softer soil. They also seemed to be inhibited by indirect cues left by other consumers, possibly as a risk‐avoidance strategy. Overall, chimpanzees and honey badgers extracted the underground nests of stingless bees with similar frequencies, whilst forest elephants did so only occasionally. Moreover, chimpanzees can use tools and other behavioral strategies to overcome the physical limitations that may constrain their exploitation of this resource.