I have film prints of those kind of clouds from 3 decades ago. It was also at sunset with the orange-pink color.My area had Mammatus Clouds last week. It's the first I've ever seen or even heard of them. If you aren't familiar with how their name originated, you might want to look it up.They went from a grey, to a pale pink, then to various shades of coral and even a vibrant golden orange.
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What an usual looking bird! Nicely captured, Roy.View attachment 407467
as i am only half way thru Junes pics i will go with this one, don't see the Black Skimmer to often.