-> than diesel trucks (and I have one, gulp.)  
Diesel truck?  
I know what you mean.  One of the more 'Unusual' sounds my parrots learn
is Kiskadee Fly catcher, who screams "Kiss my A**!" so loud the parrots
hold their ears!  Of course they learn _all_ the Grackle vocabulary.
-> Canada Geese,  QUACK, quack,quack,quack- mallards,  RATaTATAT-
The Yellow Cheek learned DUCK altogether too easily.  I've noticed that
the local GRACKLES are learning to quack.
 ^..^
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