And it's kind of cool -- if you look at the cassowary, or any of the birds that have crests on their heads, they actually grow to about 80 percent adult size before the crest starts to grow.
なかなか良い研究で―ヒクイドリの様に 頭にトサカのある鳥はどれも トサカが生える前に 成体の80パーセントの大きさに 体が成長します