This explains why it's impossible to make pacemakers with replaceable batteries. 1  Sinus bradycardia is a common reason for needing a pacemaker. Read about sinus bradycardia. 2  Read about sick sinus syndrome. 3  Read about heart block.
What Do Ferrets Eat in the Wild? Dark-footed ferrets depend on prairie dogs for everything from food to shelter to safety. These wild members of the weasel family eat prairie dogs practically exclusively and also live in abandoned prairie dog dens. They rely on these large holes for protection from eagles and other predators.
Prairie dogs make up more than 90% of the black-footed ferret's diet. A ferret may eat more than 100 prairie dogs in one year. Black-footed ferrets are also known to eat ground squirrels, small rodents, rabbits and birds. A healthy population of black-footed ferrets requires very large groups of prairie dog colonies.