An endangered snail, smaller than a grain of rice, is stalling a Limestone County bridge project over a decade in the making.

Studies of insulin, blood sugar and diabetes in other animals such as fish and dogs have already saved millions of lives and could lead to new treatments for type 1 and type 2 diabetes.

What happened when one of nature's pickiest eaters met a huge, extremely adaptable snail? Well, it might be the start of ...