These five creatures are almost "not dead"，the 507-year-old clams were killed by researchers

1.Slow moving animals. These animals can enter the state of suspended death in bad conditions, not eating or drinking, and being represented by water bears.

2. Lighthouse jellyfish. The beacon jellyfish is a representative of immortality, and the secret of its immortality lies in the differentiation of stem cells, the ability to regenerate constantly .

3.Planaria. It is an androgynous creature. Like to live in clean, oxygen-rich seawater or fresh water, if cut in half, both halves can reproduce the lost half, forming two new and complete individuals.

4.Rotifer. Rotifers have hidden features. When environmental conditions deteriorate, such as when water bodies are dry and temperatures are unfavorable, they can stop moving and, as if they were dead, they have almost no metabolism. When the environment improves, they will recover again

5.Clams. The oldest clam was found to be 507 years old, but unfortunately researchers accidentally killed it during the study.