In fact, there are 2 very different versions of this show.
The ones currently on TVDB at https://www.thetvdb.com/series/wild-russia
are the National Geographic versions named as follows:
The Secret Forest
The Great Divide
These ones run 50 minutes each, and have a british host doing the voiceover.
The other version which is not on TVDB, but should be as well was produced by Animal Planet, and is completely different. The episodes run 42 minutes each, and use some of the same footage, but not in the same order as the NatGeo versions, and have some of their own unique cuts, and are all sequenced differently than the NatGeo versions with an american host doing the voiceovers, with a completely different voice script from the NatGeos. Those are named:
The Animal Planet site for these is at:https://www.animalplanet.com/tv-shows/wild-russia/
They ran in July-Aug 2009.