A team of environmental scientists at the University of Auckland and Manaaki Whenua—Landcare Research, both in New Zealand, has found that one of the reasons for the declining population of the endangered kākāpō is a reduction in diet variety. In their study, reported in the journal Frontiers in Ecology and Evolution, the group examined recent and fossilized bird feces (coprolites) found in caves where kākāpō live.