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Re: Sinocalliopteryx (Theropoda: Compsognathidae) ate confuciusornithids and dromaeosaurids
Sparrows are interesting in another way: they practice undulating
>> flight. [...]
> David .. I've also seen corvids [magpies] do this as well.
Corvids are passeriforms.
Undulating flight would be expected to be easier for small birds (muscle
power scales with the cross-section area of muscles and thus with the
square of body length, body mass scales with the cube of body length),
but even the largest toucans (piciforms) do it, I hear.