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Cockroaches' sense of taste evolves to beat sugar traps

24 May 2013 Last updated at 10:20 BST

A mutant strain of cockroach that can outsmart the sugar traps used to kill them has evolved, scientists in the US have found.

The US team of researchers say the insects have "reorganised" their sense of taste so they perceived the glucose used to coat poisoned bait as bitter rather than sweet.

Victoria Gill reports.