How did Triceratops grow its horns?

From Bozeman, Mont., at the 61st annual meeting of the Society for Vertebrate

Paleontology

Newly discovered fossil skulls of juvenile Triceratops may help reveal how the dinosaurs grew their three trademark horns.

Until recently, scientists had unearthed the fossil skulls only of adult

Triceratops, with the exception of a 28-centimeter-long skull that likely belonged

to a young animal, says Mark B.