This 3 December 2018 video is about blue tits singing.
By watching videos of each other eating, blue tits and great tits can learn to avoid foods that taste disgusting and are potentially toxic, a new study has found. Seeing the ‘disgust response’ in others helps them recognise distasteful prey by their conspicuous markings without having to taste them, and this can potentially increase both the birds’ and their prey’s survival rate: here.
Dear Kitty. Some blog 
A beautiful little bird, Dear Kitty; with the sweetest song! 🙂
It always delights me to see the young, mouth wide open waiting for a morsel or two. 🙂
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Indeed, Carolyn! I am privileged to see this species quite often.
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