The peaCOCK is a flaunting bird. It needs an equally boastful introduction.
When the peaCOCK is butchered, it ought to give feathers that can be gilded for a good chunk of charisma AND be equippable into the eye slot to be displayed as a noble feather portruding upward through any hat equipped.
The DICKcissel, in stark contrast, is a fleeting sensation and a quite inconspicuous fellow. However, these birds are highly social and, in fact, terrifying. They travel around in huuuuge flocks and are thus also considered pests.
So, when you find one dick, a whole bag of them ought to follow right behind. I suggest that unlike other birds, these ought to be a menace that you can not fight, but that will simply sweep past an area as a group, with people having to take cover and wait for them to pass to stay unharmed.
I find that no birds are more deserving - and suitable - to be added to this classic of a game than these two.