Some animals have two hearts, a condition commonly seen in lower animals. Here are some animals with two hearts:
1. Clams: Clams include clams, scallops, mussels, etc. One of their hearts is used to send blood to the body's general circulation, and the other heart is used to send blood to the respiratory organs (gills) in the body.
2. Jellyfish: Jellyfish are invertebrates with two hearts located at the top and bottom of their bodies, which pump blood through muscle contraction.
3. Earthworms: Earthworms are annelids that have a heart at their front and back ends, and contract to pump blood to different parts of the body.
4. Salamander: Salamander is an amphibian. Their heart is divided into three chambers. The left atrium and right atrium receive oxygenated blood and non-oxygenated blood respectively, and then send them to the body tissues through the central atrium.
It should be noted that most animals only have one heart, but under certain special physiological environments, some lower animals have evolved special structures with two hearts in order to adapt to the environment and survival needs.
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