The best replacement for beaver is otter.

The best alternatives to beaver are rated as following:
★★★★★  otter
★★★★  muskrat
★★★★  woodchuck
★★★  groundhog
★★★  nutria
★★  badger
★  mink
★  gopher
★  river otter
★  whitfield
★  south summit
  fred whitfield
  clam
  coypu
  marmot
  diva
  foretravel

Your alternative for beaver is not listed? Suggest!
Speaking about beaver, one probably shouldn't forget about canadian flag.

Other search terms related to beaver and their ratings are:
★★★★★ canadian flag
★★★★ mel gibson
You have in mind a companion for beaver and it is not yet here? Propose!



Google Trends

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beaver
otter
muskrat