Arapaima

"The stately arapaima is quite large. Indeed, it is among the largest freshwater fish there are. Furthermore, these fascinating fish make quite the family unit. That is to say, male arapaimas protect their young by holding them gently in their mouths. Meanwhile, female arapaimas swim circles around these full-mouthed fathers fending off predators. It simply goes to show that cold-blooded creatures can be heartwarming too."