The Egyptian plover (''Pluvianus aegyptius''), also known as the crocodile bird, is a

wader 245px, A flock of Dunlins and Red knots">Red_knot.html" ;"title="Dunlins and Red knot">Dunlins and Red knots Waders or shorebirds are birds of the order Charadriiformes commonly found wikt:wade#Etymology 1, wading along shorelines and mudflat ...

, the only member of the genus ''Pluvianus''. Formerly placed in the

pratincole The pratincoles or greywaders are a group of birds which together with the coursers make up the family Glareolidae. They have short legs, very long pointed wings and long forked tails. Description Their most unusual feature for birds classed a ...

and

courser The coursers are a group of birds which together with the pratincoles make up the family Glareolidae. They have long legs, short wings and long pointed bills which curve downwards. Their most unusual feature for birds classed as waders is that ...

family,

Glareolidae Glareolidae is a family of birds in the wader suborder Charadrii. It contains two distinct groups, the pratincoles and the coursers. The atypical Egyptian plover (''Pluvianus aegyptius''), traditionally placed in this family, is now known to ...

, it is now regarded as the sole member of its own

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...

family Pluvianidae. The species is one of several

plovers Plovers ( , ) are a widely distributed group of wading birds belonging to the subfamily Charadriinae. Description There are about 66 species in the subfamily, most of them called "plover" or "dotterel". The closely related lapwing subfa ...

doubtfully associated with the "trochilus" bird mentioned in a supposed cleaning symbiosis with the

Nile crocodile The Nile crocodile (''Crocodylus niloticus'') is a large crocodilian native to freshwater habitats in Africa, where it is present in 26 countries. It is widely distributed throughout sub-Saharan Africa, occurring mostly in the central, eastern, ...

Description

The Egyptian plover is a striking and unmistakable species. The 19–21 cm long adult has a black crown, back, eye-mask and breast band. The rest of the head is white. The remaining upperpart plumage is blue-grey, and the underparts are orange. The longish legs are blue-grey. In flight, it is even more spectacular, with the black crown and back contrasting with the grey of the upperparts and wings. The flight feathers are brilliant white crossed by a black bar. From below, the flying bird is entirely white, apart from the orange belly and black wing bar. After landing, members of a pair greet each other by raising their wings in an elaborate ceremony that shows off the black and white markings. The sexes are similar, but juveniles are duller and the black marking are intermixed with brown.

Habitat and range

The Egyptian plover is a localised resident in tropical

sub-Saharan Sub-Saharan Africa is, geographically, the area and regions of the continent of Africa that lies south of the Sahara. These include West Africa, East Africa, Central Africa, and Southern Africa. Geopolitically, in addition to the African co ...

Africa Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...

. It breeds on sandbars in very large rivers. Despite its vernacular and scientific names, it is not present in modern-day

Egypt Egypt ( ar, مصر , ), officially the Arab Republic of Egypt, is a transcontinental country spanning the northeast corner of Africa and southwest corner of Asia via a land bridge formed by the Sinai Peninsula. It is bordered by the Medit ...

. However when it was described in 1758 by Carolus Linnaeus, the Egyptian state encompassed much of the territory that the bird is found in, including Sudan, Chad, and

Ethiopia Ethiopia, , om, Itiyoophiyaa, so, Itoobiya, ti, ኢትዮጵያ, Ítiyop'iya, aa, Itiyoppiya officially the Federal Democratic Republic of Ethiopia, is a landlocked country in the Horn of Africa. It shares borders with Eritrea to the ...

Behaviour

This usually very tame bird is found in pairs or small groups near water. It feeds by pecking for

insect Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body ( head, thorax and abdomen), three ...

s. The call is a high-pitched ''krrr-krrr-krrr''. Due to how tame it is, people often get closer than is safe.

Breeding

Its two or three

eggs Humans and human ancestors have scavenged and eaten animal eggs for millions of years. Humans in Southeast Asia had domesticated chickens and harvested their eggs for food by 1,500 BCE. The most widely consumed eggs are those of fowl, especial ...

are not incubated, but are buried in warm sand, temperature control being achieved by the adult sitting on the eggs with a water-soaked belly to cool them. If the adult leaves the nest, it smooths sand over the eggs, though if it is frightened the job may be hasty. The chicks are

precocial In biology, altricial species are those in which the young are underdeveloped at the time of birth, but with the aid of their parents mature after birth. Precocial species are those in which the young are relatively mature and mobile from the mome ...

, and can run as soon as they are hatched and feed themselves shortly afterwards. The adults cool the chicks in the same way as with the eggs. The chicks may drink water from the adult's belly feathers. The adults bury the chicks in the sand temporarily if danger threatens.

Supposed relationship with crocodiles

The bird is sometimes referred to as the crocodile bird for its symbiotic relationship with crocodiles. According to

Herodotus Herodotus ( ; grc, , }; BC) was an ancient Greek historian and geographer A geographer is a physical scientist, social scientist or humanist whose area of study is geography, the study of Earth's natural environment and human society ...

, the crocodiles lie on the shore with their mouths open and a bird called "trochilus" flies into the crocodiles' mouths so as to feed on decaying meat lodged between the crocodiles' teeth. The identification of the trochilus with any particular plover is doubtful, as is the cleaning symbiosis itself; no known photographic evidence exists, and the written accounts are considered suspect by the biologist Thomas Howell.Breeding Biology of the Egyptian Plover
by Thomas R. Howell

Gallery

File:Pluvianus aegyptius 1 Luc Viatour.jpg File:Pluvianus aegyptius 2 Luc Viatour.jpg

Notes

References

General references

*Hayman, Marchant and Prater, ''Shorebirds'' * {{Taxonbar, from=Q835119 Egyptian plover Birds of Sub-Saharan Africa Egyptian plover Egyptian plover Higher-level bird taxa restricted to the Afrotropics