It's this keratinous substance that they use in their mouths to sort of strain the water.

他们用嘴里这种角质质来过滤水。

A small and older relative of triceratops, has been found with fossilized remains of tall, keratinous bristles along its tail.

发现三角龙一种体型较小且年长亲戚，其尾巴上有高大角质刚毛化。

There's a slight discoloration in the rock, and what that is is the preservation of the keratinous nail, fingernail, of this bird.

岩中有轻微变色，那是这只鸟角质指甲，手指甲保存。

But in ornithurines this same area became covered in keratinous beak tissue, while they kept the teeth that were farther back in their jaws.

但在鸟科动中， 同样区域被角质喙组织覆盖，同时它们将更靠后牙齿保留在下巴中。