Spain, Portugal & Formentera

We are unexpectedly going to the Iberian Peninsula in June-July, hopefully for 4 weeks. Does anybody have any kind of identification manual for local voles? There are six Microtus species in the area, three of them more or less endemic, but I can’t find any info on telling them apart.

Also, if anyone is planning to be there during that time and would like to meet, please let me know.

UPD: I think I figured it out. If anyone’s interested, I can share the knowledge 🙂