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I'm fairly sure the one on the right (of the 2 adults) is male. Note the larger knob at base of bill which becomes more pronounced as the breeding season approaches. (I have also noticed that, when moving around together, it is usually the female who leads and the male follows. (It is the same with Mallards - and probably many others!)
Yes I see exactly what you describe, I had noticed it earlier but I felt the black bit on the bill should have been more bulbous for it to be a male, I wasnt aware that it got larger on the male during the breeding season.
Thanks for your message, it would make perfect sense, a female, a male and a young one. I think this is the only cygnet they had, as far as I observed over a period of weeks. Some others maybe didnt get to this age?
Re: your last sentence. Yes, you are probably right Cathal. Unfortunately, it is not uncommon for Swans (water birds in general) to lose 70-80% of their brood in the first month or so. A normal brood for Mute Swans would be 6-8 young, so having just one at this time of year would not be uncommon.
Lat/Lng: 55.128, -6.04
OS grid ref: NW425889