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Ontogeny: development of an individual
from the moment the egg is fertilized up till adulthood. Opaque area: non-transparent part. Pellucid area: transparent part. Neural fold: fold related to the head. Neural tube: extension related to the head. Heart: blood-pumping organ. Somites: metameres. Omphalomesenteric arteries: vitelline duct. Wing buds: beginning of the formation of the wings. Limb buds: beginning of the formation of the legs.
Photo :
EN : Feet
of ostrich
FR : Pieds
d'autruche
ES : Pies
de avestruz
Its feet of ostrich are very curious,
and different from those of all other birds. They are somewhat like the
foot of the camel, having a soft pad or cushion underneath, and only two
toes. The largest toe is about seven inches long, and has a broad claw
at the end; the other is about four inches long, and has no claw. Although
ostrich cannot fly, it can run faster than the swiftest horse.
Animation : Bird's eggs
Thanks to YouTube for allowing us to watch this video.