The "bad for wildlife" question basically comes down to:
* how much mass you have to move
* how much land area you have to occupy
per watt generated.
Coal and hydro lose because they both require a lot of mass (water and coal) and a lot of area (dammed waterway, mines and transport).
Nuclear and geothermal win because they both require very little mass and very little area other than the plant itself - uranium ore has at least 1000 times the energy per gram as coal.
Any kind of solar is in the middle because of the large area needed to capture relatively dilute solar energy.