Most of the birds from the main page were part of Donald's world, but many others were closely related to other of Barks' characters.
Here are a few examples:

GYRO
U$26 Krankenstein Gyro Cluckery Cluck hatches an experimental egg that Gyro has invented.	FC1184 The Cube Grandma's rooster is used in an experiment that involves Gyro's latest invention.	U$21 Gyro is pestered by the crows of the neighbourhood. Special measures are called for!	U$22 Gyro invents a Bird Thought Reader machine. Now he has to catch a bird...

MAGICA
WDCS265 Magica's pet raven assists with several of her bad deeds...	U$48 The Many Faces of MdS ...and she even 'equips' it with different faces.	U$50 Rug Riders in the Sky In order to steal Scrooge's flying carpet Magica becomes a Roc.	U$38 The Unsafe Safe A unique bird is needed to open Scrooge's safe. Magica finds it...

THE BEAGLE BOYS
FC0386 Only a Poor Old Man The Boys use trained cormorants to steal money from Scrooge's money lake.	Horsing Around with History* The Boys' trained albatross acts as a spy to learn the whereabouts of Scrooge.	U$42 The Sticky Money The Boys have a wallet stealing falcon on display in their personal zoo.	U$70 The Doom Diamond The Boys use trained bluejays to steal money from Scrooge's Money Bin.

GRANDMA
FC1047 Milktime Melodies The chickens	FC1010 A Honey of a Hen Steady Heddy, the prize egglayer	FC1161 The Farm Stood Still Roger, Heddy's chick	FC1184 The Cube Booster, the rooster

SCROOGE
U$56 The Ghost Town Railroad A flock of black ravens make trouble for Scrooge.	U$07 A carrier pigeon acts as an inexpensive bank messenger.	U$17 A Cold Bargain Scrooge finds a devoted penguin in the coldest of places.	U$47 The Thrifty Spendthrift Scrooge meets many different birds in this medieval-based tale.