Jillybean
Have a look at Froglife
http://www.froglife.org/what-we-do/froglife-scotland/
Frogs in Caithness might be too broad a subject for your dissertation. Maybe you should focus on one aspect. Froglife might have suggestions.
Breeding dates in Caithness are from late Feb to April.
Widely distributed - to see map google NBN Gateway Common Frog
Good luck.
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