and pancreatic bird houses for sale juice, respectively, and into the duodenum, the digestion in the small intestine. Pigeon no gallbladder, and chickens, ducks and other birds, have the majority of the gallbladder. Birds digesting ability, appetite is big but not by hunger, and this is a large bird flying-related energy expenditure.
Birds of the nervous system and sensory organs
Bird brain, cerebellum, midbrain, are developed. Large cerebral hemispheres, which was mainly due to increased base of the brain striatum. In birds, the striatum is to manage the movement of senior positions, but also some complex and related to living habits. Experimental results show: part of the striatum after the removal of pigeon, pigeon normal excitation and inhibition to be destroyed, affected vision, courtship, nesting and other habits of the loss. Birds in the cerebral cortex is not developed, well-developed cerebellum, which coordinate with the bird flying exercise and balance related. In the brain in the back form a pair of well-developed optic lobes.
Sense organs in birds, the most developed is flying in the air play an important role when the visual organ, and olfactory organs developed. Birds eye bird ciliary muscle to rely on well-developed vision can be rapidly adjusted by the change myopia hyperopia. Therefore, when the birds darting in the trees, the never and branches touching; or dive from a height to the ground when feeding, but also in a moment from "hyperopia" to "myopic." Birds eye haw developed, flight covered the eye, play a protective role.
Bird's excretory system and reproductive system
The kidney of birds is very large and can account for more than 2% of body weight, even more than in proportion mammalian kidney. The reason why the kidney developed, is associated with the metabolism of birds. Birds no bladder, urine less water, thick white paste, not a single urination with fecal discharge.
As with most birds, pigeons, no foreign connector (ostriches, ducks, geese, a transfer device.) Their mating, male and female pigeon hole each cloacal contact and sperm into the female line in vivo fertilization. Eggs mature, the ovary wall broke out, sucked the bell tube, such as the case of sperm, fertilized in here. Eggs, whether fertilized or not, when down along the fallopian tubes, are wrapped in protein, and then add the egg shell membrane, and finally, add in the womb calcareous shell. Pigeon eggs, incubation period of about 16 d, the chicken about 21 d, duck about 28 d.
Bird
Liang Qiu
I love birds.
I used common cage birds, who provided early in the morning in the street (liu) (da) (who now have less leisure). I feel that person's interest is not relaxed, but it is the bird's boredom. Shelves with eagle arms, and sometimes his head covered with a piece of leather, feather quill without integrity crouched motionless, where there is the slightest air of neighborhood as Angcang? Bird cage not to mention the perennial off the fence, the pecking'd drink convenience there is a shelter from the winter cotton cover is the "preferential treatment", but if you want to "fight spread upward and straight", they have to hit the head run into a wall. Birds to the point where the depression I think it probably is second only to stick to the tape on the fly,
