There is nothing special in 5oz Beaver coin.
Except the design.
I've visited the Canadian Coins and Currency and seen it in personal. Excited by the detailed Beaver visualisation.
But in order to add the Beaver to other animals, 1oz coin is enough and it is looks nice together with all "Coin and Stamp" series, with "Arctic Fox" set, "Lynx" set, Bateman's "Moose".
Bought 5oz 1 Penny as a tribute and 1oz Beaver.
IMO, for 5oz collection the
ATB coins will be the best choice.