Like escaped convicts, elephants in eastern Africa have learned to travel at night and hide during the day to avoid poachers who are hunting tuskers into extinction, researchers reported on Wednesday. Normally elephants forage for food and migrate in daylight, while resting under cover of darkness. But a sharp increase in illegal hunting driven by the global trade in ivory has forced the massive land mammals — against their nature — to upend their usual habits. “As most poaching occurs during the daytime, their transition to nocturnal behaviour appears to be a direct result of prevailing poaching levels,” said Festus Ihwagi, a researcher at the University of Twente in The Netherlands. In an upcoming study, Ihwagi details his findings, based on data gathered from 60 elephants in northern Kenya tracked with GPS devices for up to three years during the period 2002 to 2012.
The nighttime movements of the elephants increased significantly in sync with poaching levels, especially for females. Despite their intelligence, deeply ingrained foraging strategies and mating patterns developed on an evolutionary timescale may limit the capacity to adapt.
“For mothers with very young calves, the risk of predation of the calves by lions or hyenas would be higher at night,” Ihwagi said.
The real-time data from GPS devices could be used as an early warning system to alert environmentalists and park rangers, the researchers noted.
According to the International Union for Conservation of Nature (IUCN), the number of African elephants has fallen by around 111,000 to 415,000 over the past decade.
Around 30,000 elephants slaughtered for their ivory every year, mainly to satisfy demand in the Asian market for products coveted as a traditional medicine or as status symbols. — AFP
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