2007-05-16 17:39:51 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Chickens, like all birds, excrete their nitrogen-based waste in the form of small amounts of uric acid through a cloaca (nitrogen-based and solid waste are disposed through the same orifice). Mammals, on the other hand, excrete their nitrogen-based waste as urea in urine and their solid waste as feces.
Uric acid is more concentrated than urea, the general idea being to save weight by not having to carry all the excess water around in the form of urine.
This is just one of the ways that birds are able to be so lightweight and capable of flight.
2007-05-16 18:09:37 · answer #1 · answered by Sancho 4 · 4⤊ 0⤋
Chicken is a bird. Even though it does not usually fly it is still a bird evolutionary speaking. No bird can fly with a full bladder, therefore they do not produce free water. In human, for every Na passed through kidney 20 free water is filtered out. 1 Na, 1 Cl, 1 K, 1 Ca, makes for 80 free water which gets in urine.
2007-05-17 00:52:16 · answer #2 · answered by medcenman 5 · 1⤊ 1⤋
Birds have a cloaca (so their poo and wee comes out of the same hole) so when they are pooing, they are peeing too. (that's why bird poo is so liquidy).
2007-05-17 00:47:56 · answer #3 · answered by Bianca 3 · 0⤊ 0⤋
Because it doesn't have a pee-pee.
2007-05-17 00:43:48 · answer #4 · answered by cattbarf 7 · 0⤊ 0⤋