Bird biology questions. Can you help?

Question

I'm completing a project that pertains to the anatomy of birds. Here's my questions:

1. What is a medullary bone?

2. What is the noise producing organ in birds?

3. Where is the lubrication for swallowed food produced?

4. What are the 4 cartilages of the larynx?

5. What organs do birds use to sing?

6. Are there any differences between mammalian and bird kidneys?

Answer 1

1.  This is a bone in hens that stores calcium for egg laying.

2.  The syrinx

3.  In the mucous glands of oral and pharyngeal mucous membranes.

4.  The cricoid cartilage, procricoid cartilage, and the left and right arytenoid cartilages.

5.  The medial and lateral tympanic membranes.

6.  They are the infundibulum, magnum, isthmus, uterus, and the v****a.