Animal Respiration: Gill Breathing

This article provides information on gills as a respiratory organ of animals.

Respiratory System in Vertebrate Animals

Respiratory System of Dogfish (Scoliodon): With Diagram

pump mechanism: respiratory systems of insects and fish - Students

Senses and Abilities

Respiratory System in Vertebrate Animals

Define branchial respiration?

How do Fish Breathe Underwater for Kids Explained with Diagram

Fish breathing

Respiratory system

PPT - Respiratory Systems PowerPoint Presentation, free download

Respiratory System of Fishes

Animal Respiration: Gill Breathing

Animal Respiration: Tracheal System