To me this adds merely a lot of duplication actually. While I am not opposed to moving values to specific templates, without the number of template_unit_fauna_* files can be greatly reduced, keeping only those that are meaningful (e.g. elephant, whale). this patch makes little sense IMHO.
E.g. there are three bears, nicely inheriting from a *bear template, which now all three have the exact same values added. I know that in reality those three bears are vastly different and should have different stats, but until they do I do no think it is necessary to duplicate those values.

without [...] this patch makes little sense IMHO.

That's a fair point. This patch does mean more duplication. When writing it, I envisioned the following:

• move various values to specific fauna files (this patch)
• move <UnitAI/NaturalBehaviour> and the related <Vision/Range> to specific fauna files
• reduce the number of generic template_unit_fauna* from the current 25 to perhaps three or four that are meaningful
• differentiate animal stats (cf. D497, #3778, #3918), affecting gameplay

The first and second are prerequisites of the third and also make the fourth easier. This patch is already quite large, however, if you believe it's better, I suppose I could merge the first three and do all those things here.

I can ping you if I find some time/motivation for this. I want to merge D2646 first anyway ;)