EGYPTIAN PLOVER Pluvianidae
- 1 species in northern Africa
- DR personal total: 1 species (100%), 1 photo'd
Egyptian Plover, aka "Crocodile Bird," is the sole member of a newly
erected family, the Pluvianidae. It is an enigmatic wader in the shape
of a courser that lives on riverine sandbanks in the hot, dry savannas
south of the Sahel in north Africa. It is a little known shorebird
whose original claim to fame was the now discredited story that it
picked the teeth of crocodiles!
The range of the Egyptian Plover
stretches from the Gambia (where Ed Harper took this lovely shot,
above) all the way across Africa to Ethiopia, and thence sparing
southward along the Nile to northern Uganda (where John Lofgreen
photographed his bird, below), and along the Congo River to northern
Angola. It formerly occurred north along the Nile to Egypt.
species has been variously considered to be a plover, a courser, or an
aberrant thick-knee. Study of morphological characters left its
position uncertain. In recent decades, it has been traditionally placed
within the family Glareolidae (Coursers and Pratincoles), and that is
where it was placed in the Handbook of the World series (Maclean 1996).
Some argued it was closer to the Burhinidae (Thick-knees) based on
osteological characters (Strauch 1978, Chu 1995). Others, based on
initial secondary means of studying DNA, suggested it might be in its
own family (Sibley & Ahlquist 1990).
molecular evidence has helped to sort out what it is not. An analysis
of mtDNA and nuclear DNA of 90 genera of shorebirds gave evidence that
it was "apparently not a plover" (Baker et al. 2007). Fain & Houde
(2007) reviewed mtDNA and nuclear DNA of 48 taxa, including some not
previously studied, and found that Egyptian Plover "is distinct for the
Glareolidae" and found no evidence of any particular "special
relationship with stone-curlews [thick-knees]" either. The suggested
that it is a basal taxa among the Charadriiformes (like thick-knees)
and that the evidence "is consistent with the previous proposals that
it merits family status as Pluvianidae." Hackett et al. (2008), working
with even a larger set of taxa, agreed that "It is a separate lineage
that is the outgroup to plovers, ibisbill, stilts and their allies."
There the evidence current stands. There is still uncertainty about its
exact relationships, but it appears distinct enough that the IOC now
places Egyptian Plover in a monotypic family, tentatively named
Pluvianidae. For the moment, so do I.
biology of Egyptian Plover was the subject of a well-regarded monograph
(Howell 1979). It buries its eggs in the sand during the day, wetting
the sand with water, carried in its belly feathers after the manner of
sandgrouse, to keep the eggs cool. The exposed tops of the eggs are
incubated at night and, after the chicks hatch, chicks up to three
weeks old are partially buried and wetted in this same way. This
unusual behavior is shared only with some of the coursers.
myth about the Egyptian Plover as the "Crocodile Bird" has its origins
in the visit of Herodotus to Egypt in 459 BC, as summarized by Maclean
(1996): "His account of a small bird picking food from the teeth of a
gaping crocodile referred, it has been suggested, to the Egyptian
Plover. Whether or not this is so, the tale was further romanticized by
A. Brehm in the nineteenth century and R. Meinertzhagen in the
twentieth century, both of whom stated that they had personally seen
the Egyptian Plover picking the teeth of crocodiles on more than one
Meinertzhagen's veracity has been called
into question numerous times since, and apparently no one else has
documented this queer behavior. No plovers, Egyptian or otherwise, are
inside the mouth of this gaping Nile Crocodile (right). Let us put it
down as urban legend.
Photos: The uppermost photo of two Egyptian Plover Pluvianus aegyptius on the West Volta River in northern Ghana on 15 Dec 2013. Ed Harper photographed the single Egyptian Plover Pluvianus aegyptius in the Gambia in Oct 2011. John Lofgreen photographed the next Egyptian Plover
on the page at the Parra ferry crossing of the Nile River in Murchison
Falls NP, Uganda, on 11 March 2011. The Nile Crocodile was along the
Samburu River, Kenya, in Nov 1981. Bird photos © Don Roberson, © Ed Harper, and © John Lofgreen, used with permission; all rights reserved.
Since only few recent authorities consider this taxa as deserving a
full family, there is no "family book" per se. A decent introduction to
this species, with some fine photos, is in Maclean (1996).
A.J., S.L. Pereira, and T.A. Paton. 2007. Phylogenetic relationships
and divergence times of Charadriiformes genera: multigene evidence for
the Cretaceous origin of at least 14 clades of shorebirds. Biology
Letters 3: 205-209.
Chu, P.C. 1995. Phylogenetic reanalysis of Strauch's osteological data for the Charadriiformes. Condor 97: 174-196.
M.G., and P. Houde. 2007. Multilocus perspectives on the monophyly and
phylogeny of the order Charadriiformes (Aves). BMC Evol. Biol. 7: 35.
S.J., R.T. Kimball, S. Reddy, R.C.K. Bowie, E. L. Braun, M. J. Braun,
J.L. Chojnowski, W. A. Cox, K.-L. Han, J. Harshman, C.J. Huddleston,
B.D. Marks, K.J. Miglia, W.S. Moore, F.H. Sheldon, D.W. Steadman, C. C.
Witt, and T. Yuri. 2008. A phylogenomic study of birds reveals their
evolutionary history. Science 320: 1763-1768.
Howell, T.R. 1979. Breeding biology of the Egyptian Plover, Pluvianus aegyptius. Univ. Calif. Publ. Zool. 113. U.C. Berkeley, Berkeley, CA.
Maclean, G.L. 1996. Family Glareolidae (Coursers and Pratincoles), pp. 364 –383 in Handbook of the Birds of the World (del Hoyo, J., A. Elliott & J. Sargatal, eds). Vol. 3. Lynx Edicions, Barcelona, Spain.
C.G., and J.E. Ahlquist. 1990. Phylogeny and Classification of Birds: a
Study of Molecular Evolution. Yale Univ. Press, New Haven, CT.
J.G., Jr. 1978. The phylogeny of Charadriiformes (Aves): a new estimate
using the method of character compatibility analysis. Trans. Zool. Soc.
London. 34: 263-345.