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.
Ferrets make good pets. Ferrets require neither human nor ferret company for security or amusement most of the time. They are not nocturnal, but go to sleep when nothing exciting is happening, and wake up whenever a human comes to entertain them (or to be entertained by them).