This resource pack is about parrots other different colors. The resource pack is for 2 versions in the same time, for 1.12(.1, 2) and for 1.14(.1, 2, 3, 4). These other color variations are very similar to original ones and the same time different too. They have 4 color variations. The red-blue parrot variant is a bit more often than the other ones. You can find for it Cockatoo versions too and infos in their changelog.
Of course you can see some screenshots about the changes in the Images.
If you doesn't know how to add to the Minecraft a resource pack, i help you in that. After you downloaded the ZIP file to your Minecraft version, don't extract it, or it won't work. Copy the ZIP file in your Minecraft folder to the resourcepacks folder. After that run the Minecraft, go to the Settings, choose the Resource Packs and there add it to the Minecraft, wait a bit, after it's done. If you did it well, it should be working.
Here is a mod for which the mod's creator added as a little extra (i asked him) the brown mooshrooms for 1.12.2, 1.11.2, 1.7.10 and other older versions too, click here to check it! In that mod the brown mooshrooms can be breed with red mooshrooms well, not like in the Brown Mooshrooms mod, where it's sadly impossible.