While it’s impossible for humans, some animals in the natural world do have multiple hearts! From two to even twenty-three ...

Most of a hagfish's brain is devoted to scent detection. Hagfishes are counted as vertebrates, but they do cause some problems for taxonomists. A vertebrate is typically defined as an animal that has ...

The fish also had four or five “branchial slime pores,” according to the study, double what other species have. The roughly foot-long sea creature is a new species, and was na ...