The reason the animals around Chernobyl do not die of cancerous tumors is that their lifecycle is not long enough for them to develop them, supposedly.
Too late for me.
Actually the opposite is true.
Susceptibility to radiation induced cancer is directly correlated to the rate at which the cells divide.
This is why children are more sensitive to radiation; their cells divide more frequently.
Thus animals with shorter lifespans having a more rapid metabolism and more rapid cell division are more susceptible to radiation induced cancer.
Thus the NRC strictly forbids any radiation workers under the age of 18 and strictly restricts the amount of radiation a pregnant woman may receive.
In my opinion that documentary pretty much blows the dominant theory of the dangers of nuclear power plants out of the water. Wild life is thriving amidst and around the worst nuclear disaster of the Twentieth Century.