Many a human mother will encourage her kids to work out their difference between themselves–the black eagle mom takes it to another level. Black eagle siblings are known for their violent squabbles, which often turn deadly. What’s a mom to do? Use a time-out? How about just sit there and watch one sibling murder the other. Although I guess you can’t blame mom, the kids are practicing behavior seen in many bird species–decreasing the family to help to allocate food resources and ensure the survival of the fittest eaglet.