Analysis of information sources in references of the Wikipedia article "Horse markings" in English language version.
Within five years of his death, one expert would concede: 'It cannot be denied that 'Irish Birdcatcher' has done more for the racehorse than any stallion of modern days - probably than ever was heard of; not alone in speed, but in symmetry of shape and power.' His imprint on the Darley Arabian line was to become so indelible that even today silver flecks in the root of a horse's tail, or scattered over the flanks, are known as 'Birdcatcher ticks'. [from the first page of chapter 12]
