The first is by Daphne and Walter Grunebaum and the second by Gerd Volkemer

A busy week! I have put on two articles by pioneering aviculturists in the early 80s in breeding the Hyacinthine Macaw. The first is by Daphne and Walter Grunebaum, who bred successfully the first Hyacinthine macaw in the U.K and the second by Gerd Volkemer, who was one of the first aviculturists in Germany to breed this species. Both articles appeared in the Avicultural Magazinein 1984.

In addition there is a short article by Ed Bish on the first breeding of the Lear's Macaw at Busch Gardens in 1982, likewise published in the Avicultural Magazine.