TYPES OF FEET IN BIRDS
The feet of birds are also modified variously in accordance with the character of the environment and the manner of locomotion.
1. Cursorial or running feet : In running birds, the legs are powerful and the number of toes is reduced. Hind toe may be elevated, reduced or absent. In bustards, coursers and ratites such as emu, rhea and cassowary, only 3 toes directed forwards are present. Ostrich has only 2 toes, of which the outer one is smaller and without a nail.
2. Perching feet :- Majority of birds belong ,to the category of perching birds or such as Finches, sparrows, crows, bulbuls, robins, mynahs, etc. Toes are anterior and slender, while one toe or hallux is posterior, strongly built and apposable, so that they can securely fasten the foot to a branch or a perch.
3. Scratching feet :- Feet of fowls, quails and pheasants, etc. are stout, with strongly developed claws and well adapted for running as well as scratching the earth. Foot of male bird is usually provided with a pointed bony spur of offence and defense.
4. Raptorial feet :- Predatory or carnivorous birds, such as eagles, kites, vultures and owls, etc. have strongly taloned feet for striking and grasping their prey. Toes have strongly developed, sharp and curved claws. Large and fleshy bulbs, called tylari, are found on the undersurface of the toes, especially developed in the sparrow-hawk. In osprey and Ketupa, tylari are absent but horny spines are present, which help in gripping slippery preys such as fish.
5. Wading feet :- Legs and toes are exceptionally long and slender in wading or marshy birds such as herons, snipes, jacana, lapwing, etc. These serve to walk over aquatic vegetation or marshes. Web is absent or feebly developed
6. Swimming feet :- In swimming birds, the toes are webbed, partially or completely. In diving birds, like coots and grebes, the web is lobate and the toes are free. In swimming and paddling birds, such as ducks and teals, avolet only the anterior 3 toes are united in a web. In pelican and cormorant all the 4 toes are enclosed in the web.
8. Clinging feet :- In swifts, martinets kingfisher and humming birds, all the 4 toes point forwards and serve to cling to steep faces of cliffs or under caves of houses, etc.
- PHYLUM PORIFERAPHYLUM – PORIFERA HISTORY The initial advantage of becoming multicellular is the opportunity for increase in size. Larger organisms are less subject to attack; they have greater reserves within ...READ MORE
- BOMBINATOR : FIRE-BELLIED TOADBOMBINATOR : FIRE-BELLIED TOAD CLASSIFICATION OF BOMBINATOR : FIRE-BELLIED TOAD PHYLUM :- CHORDATA (Notochord, dorsal tubular nerve cord present and gill slits present ) Group :- CRANIATA ( Definite ...READ MORE
- CATLA CATLACATLA CATLA CLASSIFICATION OF CATLA CATLA Phylum :- CHORDATA ( Notochord and dorsal tubular nerve cord present and gill-slits present). Group :- CRANIATA ( Cranium with brain present ). ...READ MORE
- PLANORBIS (RAM’S HORN SNAIL)PLANORBIS (RAM’S HORN SNAILS) CLASSIFICATION OF PLANORBIS (RAM’S HORN SNAILS) KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms) PHYLUM :- MOLLUSCA (Unsegmented bilaterally ...READ MORE
- SABELLARIASABELLARIA CLASSIFICATION OF SABELLARIA PHYLUM :- ANNELIDA (Metamerically segmented, coelomate and laterally symmetrical. ) CLASS :- POLYCHAETA (Many setae, clitellum absent. ) ORDER :- TUBICOLA ...READ MORE
- LEUCILLALEUCILLA CLASSIFICATION OF LEUCILLA PHYLUM :- PORIFERA (Pore bearing, cellular grade, asymmetrical or radially symmetrical.) CLASS :- CALCAREA (Calcareous spicules present.) ORDER :- HETEROCOE ...READ MORE
- STYLASTERSTYLASTER CLASSIFICATION OF STYLASTER PHYLUM :- COELENTRATA (Tissue grade, diploblastic and acoelomate. ) CLASS :- HYDROZOA (Coenosarc secretes exoskeleton and polyps dimorphic. ) ORDER ...READ MORE
- Comparative Study of Digestive System of VertebrateComparative Study of Digestive System of Vertebrate Alimentary Canal Or Digestive System The term alimentary canal or digestive tract in vertebrates refers to an internal tube, seldom straight and ...READ MORE
- OIKOPLEURAOIKOPLEURA CLASSIFICATION OF OIKOPLEURA Phylum – CHORDATA (Dorsal tubular nerve cord, gill-slits and notochord present) Group – ACRANIATA (No head, cranium or brain) Subphylum ...READ MORE
- MELANOPLUS (GRASSHOPPER)MELANOPLUS (GRASSHOPPER) CLASSIFICATION OF MELANOPLUS (GRASSHOPPER) KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms) PHYLUM :- ARTHROPODA (Jointed appendages.) CLASS :- INSECTA (3 pairs of ...READ MORE