beak

n.

（猛禽等的）嘴，喙；鹰钩鼻；地方执法官；

复数：beaks

1. This parrot has a red beak.
   这只鹦鹉的嘴是红色的。
2. The male's orange beak differentiates it from the female.
   那种鸟雄鸟的喙呈橙色，与雌鸟不同。
3. The bird picked a hole in the ice with its beak.
   那鸟在冰上啄出了一个洞。

Molecular shaping of the beak
DOES BEAK SIZE AFFECT ACOUSTIC FREQUENCIES IN WOODCREEPERS?
NATURAL SELECTION ON BEAK AND BODY SIZE IN THE SONG SPARROW.
The cellular and molecular origins of beak morphology.
Method of forming ONO-type sidewall with reduced bird's beak
Beak and feather disease virus and porcine circovirus genomes: intermediates between the geminiviruses and plant circoviruses
Possible human impacts on adaptive radiation: beak size bimodality in Darwin's finches
The calmodulin pathway and evolution of elongated beak morphology in Darwin's finches.
Psittacine beak and feather disease virus nucleotide sequence analysis and its relationship to porcine circovirus, plant circoviruse...
Group selection for adaptation to multiple-hen cages: beak-related mortality, feathering, and body weight responses