Digital creation of glaucous macaws,
by Andrés González (© Andrés González/Wikipedia - CC BY-SA 3.0 licence)
Most ornithologists currently recognise 17 species
of living macaw. However, there are varying degrees of evidence to suggest that
several additional forms have also existed in modern times but do so no longer.
Some of them were confined to various Caribbean
islands, and I have previously reviewed those examples briefly here on ShukerNature (I have now conducted and written
up a much more extensive investigation of their cases that will be appearing
shortly). But the ostensibly lost, highly controversial species under consideration
by me right now hailed from continental South America – and, who knows, it may still do so.
Some of the most spectacular of all macaws are
unquestionably those breathtaking beauties in blue that belong to the genus Anodorhynchus.
Both in size and in colour, the three officially-recognised blue macaw species
belonging to this genus exhibit an interesting gradation.
Glaucous macaw (centre) with hyacinth
macaw (left) and Lear's macaw (right), on a Brazilian postage stamp (public
domain)
The largest of this trio is the hyacinth or
hyacinthine macaw A. hyacinthinus, named after its magnificent,
exclusively blue plumage. Next in line is the mid-sized Lear's macaw A.
leari, in which much of the hyacinth macaw's vivid cobalt shading has been
replaced by subdued turquoise.
Then comes the glaucous macaw A. glaucus,
slightly smaller than Lear's, with a plumage incorporating (as its name
stresses) a subtle range of greenish-blue and sea-green hues - particularly
upon its head, belly, and the upper surface of its tail feathers. In addition,
its throat is brownish-grey, and the feathers around the lower portion of its
face are sooty in colour. Tragically, however, this last-mentioned species is
now extinct – or is it?
Glaucous macaw, as painted by Paul
Louis Oudart for Louis Pierre Vieillot's work La Galerie des Oiseaux,
1825-1834, appearing in it as Plate 24 (public domain)
The scientific debut of the glaucous macaw took
place in 1816, when it was formally described by French ornithologist Louis
Pierre Vieillot. Its distribution at that time appeared to encompass southern Brazil, central and southern Paraguay, northern Argentina, and northeastern Uruguay, but by the end of the 19th Century this
once-common species had seemingly vanished throughout its entire range. The
reasons for this astonishing disappearance are still unknown, because the
glaucous macaw had rarely been studied in the wild, although the major felling
of yatay palms whose nuts were its staple diet, and the capturing of birds for
the pet trade undoubtedly contributed.
Over the years, however, a few specimens had been
exhibited in various of the world's major zoos - one of these was received by
London Zoo in 1886, and a well-known example lived at Paris's Jardin d'Acclimatation from 1895 until 1905.
Indeed, it is often claimed that this Paris specimen was the very last glaucous macaw.
Conversely, some authorities confer that sombre distinction upon an individual
that arrived at Buenos Aires Zoo in the 1920s and was still alive there in
1936, but there are others who believe that this latter bird was actually a
Lear's macaw.
A glaucous macaw (foreground) with a
Spix's macaw Cyanopsitta spixii, in a Hamburg animal dealer's premises, snapped by Karl
Neunzig in 1895 (public domain)
Yet even if it was a genuine glaucous macaw, there
is no certainty that it really was the last one. On the contrary, the published
literature dealing with this exceptionally secretive species contains an appreciable number of reports
alleging the much more recent existence of glaucous macaws, both in captivity
and in the wild. Some of these are very vague, little more than rumours; but certain
others are compelling enough to have stimulated cautious expectation within
ornithological circles that this controversial bird's formal rediscovery is not
very far away.
For instance, in her book Macaws: A Complete
Guide (1990), parrot specialist Rosemary Low revealed that in 1970 the late
Rossi dalla Riva of Brazil, an occasional breeder of rare parrots and very
knowledgeable regarding his local region's avifauna, claimed that glaucous
macaws nested there, but he would not name the precise locality, fearing that
local collectors would send their hunters to trap them. Low also noted that in
1988, after spending some months in the field (she did not name the area), a
very experienced bird trapper came back home and announced that he had spied
glaucous macaws, but had not been able to photograph or capture any of them.
Another early glaucous macaw illustration,
from Alexandre Bourjot Saint-Hilaire's Histoire Naturelle des Perroquets, 1837-1838 (public domain)
In his own book, The World of Macaws (1985),
Dieter Hoppe noted that he had heard tell that during the 1970s a glaucous
macaw had apparently been exhibited in a bird park either in Belgium or in the Netherlands, and that another supposed specimen had been alive
somewhere in Australia during or around 1960. Hoppe also documented a much
more tangible, firsthand encounter. Several years earlier, he had visited an
animal dealer who had shown him two very strange hyacinth macaws, much smaller
than normal and with atypical sea-green plumage; Hoppe believed that these were
glaucous macaws.
In addition, he has published a photo of an
odd-looking macaw assumed by the photographer, Tony Silva, to have been a
Lear's macaw, but which was principally sea-green in colour instead of deep
turquoise - another incognito specimen of A. glaucus? Certainly, there
is a very real possibility that there are currently a number of unrecognised
specimens of this scarcely-known species hiding 'undercover' in captivity, i.e.
erroneously labelled as hyacinth or Lear's macaws.
A glaucous macaw skin, at Huub
Veldhuijzen van Zanten-Naturalis Biodiversity Center in the Netherlands (© Huub Veldhuijzen van
Zanten-Naturalis Biodiversity Center/Wikipedia - CC BY-SA 3.0 licence)
In 1982, writing in his Handbook of Macaws, Dr
A.E. Decoteau claimed to be in regular correspondence with a European
aviculturalist (no name or country of abode given) who was supposedly breeding
a flock of glaucous macaws, from a tame pair that he had owned for several
years. However, I have yet to see any mention elsewhere of this sensational
programme of captive breeding.
Perhaps the most promising of the glaucous macaw's
many reputed reappearances in modern times took place during February 1992, following
the arrival at British Customs of a pair of Lear's macaws imported by parrot
breeder Harry Sissen on loan from Mulhouse Zoo, situated near Strasbourg, in France. When he came to Customs to inspect them, Sissen
was amazed to find that the female seemed to be a glaucous macaw. On 31 March
1992, London's The Mail on Sunday newspaper contained a fascinating full-page
account of this remarkable episode written by Howard Smith, which included an
excellent colour photograph snapped by Lynn Hilton that clearly portrayed the
sea-green colour of the bird's breast and head, with indications of brown markings
present upon its throat.
The Mail on Sunday newspaper's
article, featuring Lynn Hilton's colour photo of the Mulhouse Zoo mystery macaw
– please click to enlarge for reading purposes (© The Mail on Sunday/Howard
Smith/Lynn Hilton – reproduced here on a strictly non-commercial Fair Use basis
for educational, review purposes only)
Subsequent to its arrival in Britain, this
extraordinary specimen was scrutinised by at least two leading parrot experts,
Robin Pickering and Joseph Cuddy – among the very few people to have examined
every one of the eight preserved skins known to be from genuine glaucous
macaws, housed in various of the major museums across the globe. Neither of
them reportedly had any doubt regarding the bird's identity as a bona fide A.
glaucus.
Moreover, Peter Colston, then scientific officer at
the London Natural History Museum's ornithological department at Tring in Hertfordshire, was
shown photos of the bird by The Mail on Sunday, and he agreed that its
head was reminiscent of the glaucous macaw's. However, he also pointed out that
it did not seem to possess this species' characteristic sooty facial feathers.
A second glaucous macaw skin, preserved as a taxiderm specimen, at Huub Veldhuijzen van Zanten-Naturalis Biodiversity Center (© Huub
Veldhuijzen van Zanten-Naturalis Biodiversity Center/Wikipedia - CC BY-SA 3.0 licence)
At present, therefore, Sissen's import remains
unidentified. It may yet prove to be nothing more than a Lear's macaw (albeit
an aberrant, green-tinged one).
Yet if it really is a glaucous macaw and can be
demonstrably shown to be one (perhaps by comparative DNA tests), and if other
incognito specimens hiding in plain sight can also be found and unmasked, then the only sizeable species
of South American bird believed to have become extinct since this continent's
western colonisation will be extinct no longer, and the search for the
sea-green scarlet pimpernel of the parrot world will finally be at an end.
Glaucous macaw painting, from Monographia
Psittacorum, 1832, authored by Johann Georg Wagler (public domain)
Having said that, expeditions by ornithologists
during the 1990s to southwestern Paraguay, a potential hideaway for surviving
glaucous macaws, failed to uncover any evidence for its continuing existence.
Only the region's oldest residents had any recollection of this species, which
was apparently last confirmed there more than a century earlier, back in the
1870s. Conversely, the late George Smith, a naturalist who was very informed
regarding the history of the glaucous macaw, believed that it still survived in
remote areas of Bolivia, where trappers encountered by him were able to
identify it.
Smith also noted that when he had flown over these
areas, there were vast stands of palm trees, "as far as they eye could
see", but these have still never been scientifically investigated, so who
knows what secrets they may be hiding? Tellingly, the IUCN still categorises
this enigmatic bird as Critically Endangered rather than as Extinct.
Moreover, if we wish to confirm that the longterm
concealment of a brightly-hued parrot species of stature in South America is by
no means impossible or even unparalleled in modern times, we do not have to
look far to offer a very apposite precedent, no further in fact than one of the
glaucous macaw's very own congeners – Lear's macaw.
The existence of this famously elusive species first became
known to science in 1831, when Victorian bird painter and nonsense-rhymes
writer Edward Lear painted a macaw of unrecorded origin that he believed to be (and
duly labelled as) a hyacinth macaw but which was later recognised to be a
separate species. In 1856, it was named in honour of him by French biologist
Charles L. Bonaparte (although some authorities also refer to it as the indigo
macaw).
Edward Lear in 1867, and his exquisite painting from
1831 of the macaw species named after him (public domain)
Yet despite having been represented in aviaries worldwide since
1831, Lear's macaw remained a major conundrum to ornithologists for over a
century - because no-one knew where these captive specimens had actually been
caught. Not even their country of origin, much less their precise
provenance, was known. Indeed, a prevalent view back then was that this species
might even be extinct in the wild - always assuming that it was a valid
species, and not a hybrid of the hyacinth macaw and the glaucous macaw, as some
researchers were beginning to suggest.
In 1964, the late Dr Helmut Sick, a German-born Brazilian
ornithologist, began an intensive programme of searches for this mysterious
missing macaw in a bid to solve its riddles once and for all. It was a
programme that would take 14 years before success arrived, but arrive it did.
On 31 December 1978, he spied three Lear's macaws in a little-explored area of Brazil's
northeastern Bahia region, called the Raso de Catarina. And in January 1979 he
sighted a flock of about 20, proving that it was not a hybrid form. These
turned out to be part of a population numbering just over 100 birds.
Moreover, in June 1995, a team of
Brazilian biologists discovered a second population of Lear's macaw, several
hundred miles from the first one, consisting of 22 birds on a nesting cliff. By
2010, the total wild population was estimated to be just over 1,000 birds, and
it is also represented in captivity.
Although only three species of Anodorhynchus
macaw are formally recognised nowadays, there was once an alleged fourth, and
even a fifth, member of this genus. The fourth, of which more is known, is (or
was) the purple macaw, the fifth the black macaw.
As noted earlier
here, in terms of plumage colouration this genus's official trio of species can
be arranged in a very neat gradation, beginning with, as its name indicates,
the intense hyacinth-blue shade of the hyacinth macaw, then moving subtly into
the slightly more turquoise-blue hues of Lear's macaw, which then transforms
further, yielding a paler, turquoise-green or sea-green shade, in the
aptly-named glaucous macaw.
But what if this
colour gradation were also extrapolated in the opposite direction? That is, in
addition to the hyacinth macaw's striking blue hue faintly greening into
turquoise and thence even more so into a glaucous tone, how about deepening it,
to yield a macaw whose plumage was a darker, predominantly violet or purple
shade?
The
purple macaw, as depicted by celebrated bird artist John G. Keulemans in Lord
Walter Rothschild's classic work Extinct Birds, 1907 (public domain)
If this quartet
of macaws were then arranged in a continuous linear spectrum of transforming
colour, running from purple into blue into turquoise-blue into pale
turquoise-green, the line-up would be: purple macaw, hyacinth macaw, Lear's
macaw, and glaucous macaw. Of course, the purple macaw is purely hypothetical –
isn't it?
In reality, such
a bird may actually have existed – so if you'd like to read about the purple macaw's
fascinating history, as well as that of a possible fifth Anodorhynnchus
species, the even more obscure black macaw, as prepared by me exclusively for
ShukerNature, all you need to do is click here!
A
pair of digitally-created purple macaws discovered online (original source presently
unknown to me – reproduced here on a strictly non-commercial Fair Use basis for
educational, review purposes only)
This
ShukerNature article is very greatly expanded and updated from my original 1993-published
coverage of the glaucous macaw contained in my book The Lost Ark, which in turn was the first in
my trilogy of groundbreaking, definitive tomes collectively documenting new and
rediscovered animals of the 20th and 21st Centuries.
Incidentally, please
note that my glaucous macaw coverage did not reappear in either of The Lost Ark's two sequel
tomes – The New Zoo (2002) and The Encyclopaedia of New and Rediscovered Animals
(2012). So now, and constituting yet another ShukerNature exclusive, this is
the first time that it has been reprinted (and updated) in more than 25 years.