Sorry if I touch a very sensitive subject
But after reading a lot about specially on a Catalina macaw it makes a good sense to me because you get the less aggressive scarlet macaw and create gentler, more beautiful bird.
In response to marrying a monkey
I never said a person can marrying a monkey ....( I don't know if thats a metaphor for something else regardless)
I am part black, white, yellow, brown as my ancestors
We are the rainbow breed but we are all humans
And i am Very proud of that.
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My original post was not meant to be racial but i was just trying to be funny and not taken literally.
Nonono, I was trying to use an example.

Humans are all the same SPECIES, different types of macaws are not. Lets say people are like budgies, even though they come in all different colours and types, they are all the same species. It doesn't matter if you breed a blue to a green, a pied to a normal, an english type to a wild body type. They are all budgies, and the offspring are still budgies, of the same species as the parent. Just like people of different races.
But a scarlet or a blue and gold macaw, or ANY species of macaw are NOT the same species. While the budgies are 'apples and apples' even though one may be green, and the other red, they are still the same species. Just like people. But a scarlet and a b/g or a military or a hyacinth macaw are not the same species. they have evolved from a common ancestor, but have diverged enough to be separate species. they are apples and pears. Just because you CAN crossbreed them, doesn't mean you SHOULD. Sometimes it gives good results, like the catalina. Think of a nashi fruit (applexpear fruit) that combines the best traits of the parent species. But most of the time it gives horrible results, with birds with conflicting bio rythyms for breeding and mating that makes them miserable, strange and often impossible to meet dietary needs (in particular with hyacinth crosses) and so on.
"But after reading a lot about specially on a Catalina macaw it makes a good sense to me because you get the less aggressive scarlet macaw and create gentler, more beautiful bird."
"In the perspektive of breed for certan behavior as don with dog I think that hybride could be a good thing "
In theory, yes. Controlled hybridisation can produce 'better' pets. Controlled being the word. F1 catalinas make wonderful pets, and the genetic pattern (bg one half, scarlet the other on the genome) is known. F2 and onwards catalinas (that is, the offspring and their offspring from the first cross) are however unstable, as genes 'swap over' and recombine in the process of making gametes, that will eventually become a new chick. This means instead of BG on one side of the gene, and scarlet on the other, it becomes a mix all around. This means instead of inheriting the traits as the first crosses did, they can inherit BAD traits from BOTH sides, potentially making them MUCH worse pets then the original species.
Bs
BS
bS
BS
Catalina F1 hybrid genome example above.
SB
bB
SS
Sb
Catalina F2 hybrid genome example above
B/b- B and G - S/s Scarlet
Capitals are dominant genes, lowercase recessive. lets say for example all the dominate genes (Alles, whatever) in the first one are 'good' genes we want in the offspring, which is usually what happens with F1 catalinas. In the second one due to translocation of alleles and parts of the genome when gametes are formed (sperm, egg) we end up with a mixed genome. This means we have no control over the combination of genes the offspring of a catalina x catalina mating will have, and we could end up with vicious birds, sweet birds, anything. It's more risky and near impossible to predict compared to the original species. And these multi generational hybrids also have a plethora of health problems (The initial crosses escape this, but their offspring do not) due to health issues from BOTH species existing in the one creature.
This is in addition to my previous post.
Unless you have a VERY sound understanding of genetics, you should not be breeding hybrids. And if you DO understand genetics, your not going to want F2 and beyond crosses to exist ever, and when we produce f1 birds we have no control over whether they mate of not after we sell them. Meaning, we are indirectly responsible for the offspring.
And, although I have used catalinas, cats are the EXCEMPTION TO THE RULE here. Most hybrids (even F1 hybrids) are 'worse' pets then either of the parent species due to behavioural issues arising from conflicting bio rythyms, etc. They lead miserable, confused lives. Hybrid love-birds being an easy to point out example here, some of which are believed to suffer from 'bird depression' as a result of their conflicting natures.
"Hybridising" dogs is not hybridising birds. Dogs are the same species (Canis familaris). A hyacinth and a scarlet are not.