Thank you for the information!
Interestingly enough, the image you posted came from one of my albums that contains hybrids! That, and I was curious to know what ever may have become of the bird!
To be more on topic...
It's a fine line between species, subspecies and variations. You can have variations within a species or subspecies. I know some people frown upon Wikipedia, but it contains some useful information which may be worth reading...
Species - Wikipedia, the free encyclopedia
Subspecies - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Hybrid_(biology)
Now as far as the health of hybrids go, as stated, it depends on how closely the parents are related. The closer the parents are, the healthier the offspring will be, kind of like what is believed to be in mutts between two different breeds of dogs... however, it's not always true that the resulting offspring are healthier than their parents. When they are, it is known as hybrid vigor. This is where the hybrid offspring have more genetic code than both parents, thus less chances of bad recessive genes causing problems.
For example, a Scarlet Macaw x Green Wing or maybe a Jenday Conure x Sun Conure. These hybrids have the highest chance of being healthy because they are pretty close together genetically speaking. (although I am not a scientistic - just because two different species look similar doesn't mean they'll produce healthy offspring)
Heterosis - Wikipedia, the free encyclopedia (Hybrid Vigor)
The opposite is also possible... outbreeding depression. Outbreeding depression is where we see animals with problems. It could be something as simple as incompatible behaviors (a hybrid peach face x "eye ring" lovebird not being able to decide between tucking nesting material in the rump or carrying it in their beaks) to infertility (mules), or worse.
For example, Sun Conure x Green Cheek Hybrids. It is unknown whether they are fertile or sterile, however the chicks have a high mortality rate as well as a chance of birth defects (I've only seen feet so far). I've also heard through the grapevine (as it were) that one breeder had a pair of hybrid macaws that were born with their innards in the incorrect places.
Let me ask you... with how common hybrid macaws are, have any of you seen 5th generation hybrids? What about 6th generation hybrids? If they are out there, they aren't very common! I have heard that infertility is an issue in the hybrid macaws, the further along that you breed.
Outbreeding depression - Wikipedia, the free encyclopedia
In short, I am against people hybridizing animals. If it's going to be done, I want to see it done responsibly! And I want to see the hybrid offspring sold as hybrids! And I read through that link about hybrid vs crossbred eclectus... well, if you breed two subspecies together, it's still a hybrid.... and everyone is against hybrid eclectus!
What about hybrid green cheeks? Or hybrid senegals? Did you know that both species have subspecies? Or that mitred conures do as well? And blue crown conures? If you are against hybrid eclectus, think about how many other species are out there with subspecies? Then think about how many hybrids we already have within captivity if people were unable to differentiate between the different subspecies?
If you own a species that also has subspecies, there's a chance that the bird you have could be a hybrid, and you don't even know it! Isn't that a scary thought!
If you are interested in hybrids, I've been gathering photos, preferably of the rarer/unknown hybrids, but a few known ones as well. Link is as follows.
Flickr: Hybrid Parrots