So I have this unscientific theory that fits most bird species. As with most "rules", there are, of course, exceptions.
When Nature was giving out her gifts to the birds, the birds were given the choice of two out of the following three choices:
1. Flight/Swimming Ability
2. Beauty
3. Song
Take the little House Wren, for example. At a quick glance a tiny relatively plain brown bird that does have the gift of flight but oh my goodness, what a song this little bird can sing.
Then there is the Great Blue Heron - a stately looking bird with graceful flight and a huge wingspan. And then the heron opens its bill to speak and all that is heard is a loud squawk. :)
And onto the Yellow-Headed Blackbird. Like the House Wren, it has good flight and is a stunning beauty with that deep yellow contrast against the black feathers. And then the song, it's been described as a heavy door swinging on a very rusty metal hinge.
So here's another contender for the best of two out of three:
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