Legolas almost Yavanna's explanation to be true, but considering that his father taught about the natures of the Dwarven king, he couldn't accept them. Not yet, anyway. Besides, it wasn't enough to convince him otherwise. He looked to Thorin, before he glanced back to his father. 

Saeril was quite surprise at her response, but not at all on how she was saying it. The elder held the same views for each and every race thriving within Middle Earth; their differences shouldn't matter.