“据称考拉在野外从不喝水，或仅偶尔喝水。它们的饮水行为通常被认为是不正常的，并被归因于疾病或严重的受热应激现象。” Mella 说。
“人们认为，考拉是从它们所取食的叶子中获得所需的大部分水分，并在雨后或叶子表面有露水时因为吃了湿叶子而无意地在野外喝水。” Mella 补充说。
WASHINGTON (Reuters) - Scientists have solved a lingering mystery about koala behavior - how these tree-dwelling marsupials native to Australia consume enough water to live.
A new study describes koala drinking behavior in the wild for the first time, finding that they lick water running down the smooth surface of tree trunks during rainfall - a phenomenon called “stemflow” - and do not rely merely on the water content of the leaves that make up their diet.
The findings, which the researchers said may be useful in koala conservation efforts, were based on 46 observations of koalas in the wild from 2006 to 2019, mostly at You Yangs Regional Park in Victoria state.
“Koalas have been alleged to never drink free water in the wild, or to drink only occasionally. Drinking behavior has often been considered unusual and attributed to disease or to severe heat stress,” Mella said.
“Koalas were thought to gain the majority of the water that they require from the moisture content in the leaves that they feed on and to drink water unintentionally in the wild by eating wet leaves after rain, or when dew is present on the leaf surface,” Mella added.
They sleep about 20 hours a day to conserve energy because their diet requires a lot of energy to digest.
“Koalas are nocturnal animals, so they are only active at night, and they are arboreal, which means that they live in trees and rely on them for food, shelter and, as we just discovered, also for drinking,” Mella said.
“Koalas actually spend 98% of their lives in trees and the only time they are on the ground is when they are trying to find another tree with a more generous food supply or a mate.”