Which of the following characteristics is applicable for birds?
A
Absence of urinary bladder
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B
Persence of dicondylous skull
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C
Ribs without uncinate processes
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D
All of the above
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Solution
The correct option is A Absence of urinary bladder Birds do not have a urinary bladder or external urethral opening and uric acid is excreted along with feces as a semisolid waste.
Aves have a monocondylic skull.
Ribs have uncinate processes. Uncinate processes are bony projections that extend from the vertebral ribs in Aves.