Feline obsession with catnip and silvervine may help keep bugs away

It’s no secret that (most) cats are obsessed with catnip and a somewhat lesser-known plant called silvervine. The plant materials often provoke a euphoric response in cats, resulting in behaviors like playfulness, meowing, and rolling out. That latter activity — rolling on the silvervine and catnip — may have a secondary, and quite useful, benefit for cats. Catnip refers to …