First look at Shedd Aquarium's newest beluga whales

Shafts of sunlight angle into glistening turquoise water. Four beluga whales, in near-synchronized perfection, glide by, eyeing the cluster of visitors on the other side of a huge picture window. One of those visitors is Karisa Tang, Shedd Aquarium’s vice president of animal health. Tang’s hand goes to her chest at the approach of these most graceful creatures — even though she’s seen Acadia, Lillooet, Osiris, and Sierra countless times before. “That’s stunning in the sunlight,” Tang says…