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The first two links are irrelevant because they describe physical characteristics and not a well defined line. The quotes you copied are vague descriptions at best.
The last quote you emphasized says "it can be defined" which shows it's not a well defined line. Also, there are quite a few cross-species hybrids that have produced fertile offspring.
Here's a list of some
These birds aren't even in the same family and have hybridized
The concept of a species is a lot more flexible and less-defined than you think.