Q. Preen glands occur on
A) Reptilia
B) Aves
C) Pisces
D) Mammalia
Explanation
Preen glands are present at the base of tail and seretes oil to keep feathers water proof.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.