Dines went on to say that a normal gray whale pregnancy lasts for about 13 and a half months. He estimated that these conjoined babies were probably between eight and a half and ten and a half months old. Moreover, even if these twins had gone to a full-length gestation, he felt that it would have been extremely unlikely that they’d have survived in the wild.
Dines explained that because the twins were joined at the stomach, this would have made it virtually impossible for them to breathe. Like all whales, these animals would have had to come to the surface for air. However, being joined at the stomach would have meant that their blowholes were pointing to the side instead of upwards. Consequently, they’d have been unable to take in the air they needed to survive.