Pretty amazing - near the end of the article they discuss just that, "Although tree-thinking biologists used to think that hybridization was extremely rare, ge

Pretty amazing - near the end of the article they discuss just that, "Although tree-thinking biologists used to think that hybridization was extremely rare, genetic studies have shown that it actually happens all the time. Human DNA indicates that early Homo sapiens interbred with Neanderthals and other extinct hominins. Conservative estimates suggest that at least ten per cent of birds hybridize; among South America’s largest group of birds, that number is thirty-eight per cent, according to one recent study." "Semi-lattice", networks; I guess it's a lot more complicated than I ever imagined.