I personally had thought it was a 5th year bird from this video, but further evidence from photos we (Joan and I) decided to go 4th year Bird... Joan has some photos showing the underwing linings which show evidence of the bird in its 4th year. To confirm our thoughts we contacted one of the nations leading experts.... below is Jerry's take on it.
"It appears the bird has molted 3 times which would make it a 4th year bird, but depending on energy, location, health, and a few other factors some birds molt slower than others. Hope this helps
Jerry Liguori HWI Educator"
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