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waiting for a giant bird

>I don't see the mystery here about the absence of multi-ton birds.
>David writes: 
>1) Most birds fly and so there has been an evolutionary "pressure" to keep 
>most of them small enough to get off the ground.  

Sorry for the shameless advertising but see ch 8 of *Why Elephants Have Big 
Ears: Understanding Patterns of Life on Earth* (St martin's Press in the USA) 
where many of these arguments are covered - incorrectly, possibly, but covered 

Best to all

Dr Chris Lavers
School of Geography
University Park
Nottingham NG7 2RD