In the UK, it has been shown that at every solar farm looked at, there were more species, from insects such as butterflies, to mammals such as hares do well.
I would argue that these areas are not as good as reserves, but it is still a positive benefit. Indeed, it is conceivable that if wolves and bears returned to the UK, these sites could be fantastic for these animals.
It is true that why UK species might be fine to wander between solar panels, it might be different in Africa. I cannot imagine a solar panel (even on a sturdy frame) survive an angry elephant.
However, throughout a great deal of the world, perhaps solar farms (along with other similar infrastructure might be used to create corridors between important habitat in many countries around the world.
Having said all this, the government must level the playing fields between solar farm companies, and individual homes. There are 2600 square km of rooftops in the UK, and we need less than 1000 square km in the UK to go 100% solar powered. So what does this mean? It appears that solar farms are good for the natural world in the UK, as such some farms are a good idea. Never the less, I would argue that the UK government should be working towards putting solar panels on most roofs in England. Bring back sensible subsidies, to encourage this behaviour.