The whales Gracie and George were stated to have wandered into San Francisco as calves. Outside of feeding events which can include the famous bubble nets, humpback whale pods usually consist of a lone mother and calf (or calves) pairing with a trailing "escort" male. Humpbacks are one of the few mammals that can be nursing and...
The show had already established how Tendi has green blood earlier in the series after an injury and it would have been an easy to infer detail compared to humans in the show....
By that I mean that the basic premise being: that the means of (re)creating new technology is lost, the current technology around is treated as sacred and the function marred in elaborate rituals or prayers because they don’t know how to otherwise operate it, and to a lesser extent that new ideas or (often xenophillic)...