Tiny dinosaurs

["Timothy Williams" <twilliams_alpha@hotmail.com>]

Somebody was asking about teeny-tiny dinosaurs.  There's some very small 
dinosaur specimens known only from teeth.  A tooth-crown known for _Koparion 
douglassi_ (?troodontid; Late Jurassic, Utah) measures 2mm high.  Several 
Late Triassic putative ornithischians from North America are known from 
tooth-crowns 2-3mm high: _Lucianosaurus wildi_, _Pekinosaurus olseni_,  
_Tecovasaurus murryi_.  But who's to say these teeth didn't come from 
juveniles (even hatchlings)?

The smallest adult dinosaur I know of is _Mellisuga helenae_ from Cuba.  
Males measure about 5.5 cm long (about 2.17 in), and weigh only 1.95 g 
(about 0.07 oz).  It's commonly known as the Bee hummingbird.


Tim
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