They have three hearts. Two hearts pump blood to their gills, and one heart spreads oxygenated blood.
They also have three hearts. Two hearts pump blood to their gills, and one heart circulates oxygenated blood.
They have several pairs of hearts that pump blood around their bodies and help carry nutrients.
They have four hearts, one main heart, and three extra ones near their gills to help circulate blood efficiently.
Some species have lots of hearts, usually around 12 to 13.
They have many small hearts spread throughout their bodies, helping to pump their version of blood.
They have three hearts. One heart pumps blood around their body, and the other two focus on moving blood over their gills.