On our whale watching trips we see mostly humpback, finback and minke whales, and Atlantic white-sided dolphins.
None are unfriendly, but some ytpes just seem more interested in boats.
A young whale that loses its mother is on its own. Females that are nursing a calf already are the ones that would have a supply of milk, but they have just enough for their calf. The quicker a young whale can fend for itself, the better its chances of survival. If hydrophones can be used, we may hear sounds being produced by large whales and dolphins. Thanks for the questions.