Animals that roam in the wild fare poorly when they are caged in zoos, according to a new study that calls for an overhaul of the way such animals are kept.
In captivity, nomadic animals like polar bears have a higher infant mortality rate and show more abnormal behaviour than naturally sedentary animals do, according to British researchers who analysed 30 years of scientific data.
The problem is so widespread worldwide that most zoos need to improve their confinement conditions by building larger, more complex exhibits for roving animals, said Georgia Mason, an Oxford University zoologist and the study's lead author.
Alternatively, zoos could phase out roaming animals.
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