"In natural science the principles of truth ought to be confirmed by observations." (Linnaeus). "Though, preferably backed up by a series of high quality digital photos and video." (KerryBirding).
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Saturday, 24 January 2015
Chiffchaff collybita & tristis comparison
Comparison between colybita Chiffchaff and tristris Chiffchaff, Kerry, January 2015. More on the ringing and ID of these birds soon...
