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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. Richard D

    Bluetit - Him or Her?

    Side by side images knowing which was which would be interesting. I think the range of colour variation between individuals is quite marked so with some pairs it will be more obvious than others.
  2. Richard D

    Bluetit - Him or Her?

    Ah - sorry I thought you meant depth as in extent. I find the colour differences difficult to judge in person - I really don't think you stand a chance from a nestcam picture, but matbe someone else can.
  3. Richard D

    Bluetit - Him or Her?

    I've not heard of depth of cap being a distinguishing feature. Females sometimes appear slightly greener and less blue, but whilst that is a reasonably good indicator if you see a pair together as to which is which, it's not 100% reliable.
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