Beavers Are Also a Danger to the Dikes. Near Zwolle, They Placed Transmitters in Their Tails. ‘Do You Hear the Beep? That Is Beaver 7.’

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Along the IJssel near Zwolle, burrowing beavers pose a growing risk to the river dikes. A dike manager and a muskrat catcher are developing their own techniques to locate and monitor beaver dens, including a sounding rod with an avalanche transceiver and radio transmitters in beaver tails.