The 2-metre lengthy sculpture was taken from Chilstone, close to Tunbridge Wells, between Wednesday night and Thursday morning.
Kent Police consider that the three-quarter tonne hippopotamus might have been lifted onto the again of a truck by “mechanical means”.
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They appealed for witnesses who might have noticed the “vastly distinctive” sculpture, which requires the energy of 5 individuals to raise.
PC Nick Lingham stated that the thieves would have wanted a big car and probably a winch to steal the sculpture from the enterprise’ present gardens.
He added: “It’s clear these accountable would have wanted a big car similar to a flatbed truck and will have additionally wanted to raise it by mechanical means.
“It’s a vastly distinctive object and it’s unlikely the offenders will discover it that simple to promote on as scrap or to a collector.
“Due to its sheer measurement we hope individuals might have seen it being transported.”
No different gadgets had been reported stolen in the course of the raid on Chilstone present gardens, police stated.
On its web site, Chilstone is described as a maker of “bespoke” backyard ornaments and lists Kensington Palace, Kew Gardens and the Nationwide Belief as clients.
Further reporting by PA