The movement and positioning of the fins also come into play when smaller ... also aids in respiration by bringing water to the animal's gills, which in turn filter oxygen into its bloodstream.

which is attached to the gills and functions similarly to a human lung. Although the species is renowned for its stunning appearance, wild bettas are smaller with shorter fins, and are a dull gray ...

Fish are animals that live in water and breathe through their gills. Gills are like underwater lungs. They have scaly skin that helps them to move through the water and fins that help them swim.

The coelacanth has gills similar to those of fish living ... Coelacanths even move their paired fins much like land animals move their limbs: the right pectoral fin moves in conjunction with ...

When scientists finally found the “unusual” animal, it turned out to be a ... slender,” “worm-like” bodies with gills but no fins. Their “pointed” heads have “large” teeth ...

A fish (with scales and gills) clearly resembling a tetrapod (with a flat head, a neck and prototypes of terrestrial limb bones in its lobelike fins), it ... even propel the animal in shallow ...