Owls would have no problem spotting the Twit Twoo collar with their eyesight.

Not 100% sure what breed of owls these could be and they look too 'friendly'  for me to visualise them swooping down and eating some rodent.

Without even running to Google I do know it's Tawny Owls that make the Twit (made by female Tawny Owls) and Twoo (made by the gentlemen Tawny Owls) calls. That's the sum total of my owl knowledge - sorry.