No interactions present.
We have three very similar species - T. arcuata, brevicornis, and notha. Overall in Highland I have found arcuata most frequently, but had brevicornis on Raasay the other week. T. notha is also around just now. You can only do females, and they need an intimate examination for a species ID.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
I agree Murdo arcuata is very common in the NW here but as you say difficult to be absolute Fantastic island BTW
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