SGARs (Second Generation Anticoagulant Rodenticides) are poisons mainly used for rat and mice control. They have taken over the market from the first generation rodenticides (FGARs) such as warfarin as they only require the target animal to consume it once whereas FGARs need multiple feeds to kill the rodent. However SGARs have a much longer half life in the dead rodent (Half-life is the time it takes for the concentration of the poison to drop to half its original level). FGARs' half life is a few hours, SGARs' about 3 months - it's easy to see why apex predators eating rodents on a daily basis are likely to eat poisoned animals and how the poison builds up in their bodies.