Sealing gaps and securing food can fight rodent infestations while protecting predators
Mice and rats can spread dangerous viruses and bacteria, trigger asthma attacks and damage property with their constant gnawing. So when rodents get indoors, most people take action to help keep their home safe.
Rodents like mice and rats can spread dangerous diseases, cause damage to property and trigger asthma attacks. To keep homes safe from these pests, many people use rodenticides, but these poisons can unintentionally harm wildlife. Anticoagulant rodenticides, which prevent blood from clotting, can cause internal bleeding in rodents and eventually lead to their death.
However, when predators such as hawks, owls, foxes and coyotes consume these poisoned rodents, they can also suffer fatal poisoning. A study by Maureen Murray found that 96-100% of birds of prey tested were exposed to anticoagulant rodenticides, with some exposed to two or more different types. Another study identified bromethalin, a neurotoxic rodenticide, in 30% of birds tested, but its relative risk to wildlife remains unclear.
To control rodent populations while minimizing risks to wildlife, Murray suggests sealing entry points, securing food and using snap traps instead of rodenticides. By making properties less attractive to rodents, both families and wildlife can benefit.
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