Since the opening of the lemur forest exhibit earlier this year, the Tennessee Aquarium’s ring-tailed and red-ruffed lemurs have demonstrated time and again that they’re keenly aware of what’s going on above them. When they spy a plane or hawk passing overhead, these intelligent mammals will sound a thunderous warning call alerting to the presence of a potential predator. Ring-tails, in particular, also are well-known for adopting a yoga-like posture to bask in pools of sunlight — an act known as “sun worshipping.”So how will these sky-watching, light-loving animals react during the two minutes of darkness on Aug. 21 as the Southeast experiences its first total solar eclipse in nearly a century?