Egg

Egg
Interior view of a bird's egg: hard, porous shell enclosing an embryo and the substances that nourish it during incubation.
Shell: hard crust covering and protecting the egg.
Developing embryo: small pocket related to the germ.
Air space: part of the egg containing only air.
Vitellus or yolk: part of the egg which develops into an embryo once the egg has been fertilized.
Albumen or white: white of the egg, which nourishes the embryo once the egg has been fertilized.
Amniotic liquid: liquid substance in the amnion.
Embryo: bird which has not yet hatched.
Allantoic fluid: one of three extensions of a bird embryo.
Shell membrane: membrane on the inside of the shell.
Chalaza: part of the white of the egg.

Photo :

EN : Feet of ostrich
FR : Pieds d'autruche
ES : Pies de avestruz

Feet 
          of ostrich

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.