The company says:
Beaver Eau de Parfum debuted in 2014. In 2016 we improved the formula by redesigning the linden-blossom top notes accord, removing the smoke and ash notes, and enhancing the base notes accord with even higher quality musks. We also introduced a light leather note, an attribute of the real castoreum musk.
There are 10 reviews of Beaver (2016) by Zoologist Perfumes.