Small stories I’ve learned. The fourth.

I would like to organize a compendium on birds, but I have no idea on how to do it. Alphabetically is not an option.
What are the perfect criteria?
Origins. Sizes (of the beak? the wingspan? height?). Number of colours or colour-pattern? Types of colour (hot, cold, bright, in relation to colour spectrum physical measurements?) Symbolically; but then again, is the cock the National Symbol of France, the Redemptive of Portugal, or the Guardian of Korea?. Nourishment (parequeets eats insects, owls and eagles raw meat, parrots fruit, vultures and secretaries rotten meat). Popularity. Rareness (the Dodo) or Abundance (pigeons)? The way they stroke their beaks together in, as it were, a kiss, or the way they feed their chicks. Maybe the seduction rituals or the mating dance. Separating the ones that migrate from the sedentary. The frequency and tones of their flight, movement, songs. The real, the existent, the imaginary birds, such as the Phoenix, the Simurgh, Arjuna's bird, the Barcelos' cockerel. The beak curvature: from the eagle to the periqueet. Their strength. From the docile to the aquiline. Intelligence: from the chicken to the gavion. A separate pamphlet, only for birds that invade other bird's nest and throw away the eggs they find there, as the cuckoo. Birds that have no problem in embracing others than their own chicks.