Goldcrests

Reading, UK. Canon R6 + 800mm, 1/1000s, ISO12800 (AKA overcast and slightly misty as befits Halloween).

First time seeing a pair together (and not often seen at all) - though its possible both of these are females, none of my photos show the distinctive orange in the crest of the male.

Across the pond you might call them one of the Kinglet family, but to be precise, Regulus Regulus.