Dad comes home with tea and apart from mum, junior and baby... we seem to have an interloper. Now is it just being opportunistic, friendly... or tolerated as part of the family (from previous?). Haven't got a clue. Just odd! (also seen image (not mine) with one bird with yellow ring (and two others)... no sign of this bird or yellow ring has been lost). Just wondered...
We have a pair of Bull finches that often have a young male in tow.
I reckon the female may encourage a bit of back up and the Male tolerates it as it's a bit of pressure off him as long as the youngster knows its place. Meanwhile.....
Females are notoriously fickle - she's probably not only playing the youngster along as a bit of strong arm but also has him as a back up.
I was taught as a youngster that birds paired off and were faithful....HAH!! I think not regarding the recent scientific research using DNA.
Those females (just what I've seen with our blackbirds) are arch manipulators .
I really can't tell you on a family forum what they get up to - it's terrible.

Our recent BB father probably isn't the father of the chicks in our bushes that he's losing his tail (and other) feathers over :smoke:
Pat