A bison - is a perfect idea! Just go to the Kyivan zoo))) sorry for irony, but I would first define what parts of Ukraine you would like to see and then check the weather forecast for March. it's very helpful to be able to read in Cyrilic.
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Here you´ll find many ideas for ALL regions of Ukraine ))
We also have bison back home in Denmark:
"In June 2012 one male and six females were moved to the Danish island of Bornholm. The plan is to release these animals into the wild after five years of adjusting to the island's environment. The plan is that the bison will aid biodiversity by naturally maintaining open grassland."
There are some in Ukraine, but the best place for bison-spotting is definitely in Belarus, in this amazing forest: