FWIW, there is extensive background in the Canadian scientific report that the Guardian article links to, title of which is:
First account of apparent alloparental care of a long-finned pilot whale calf (Globicephala melas) by a female killer whale (Orcinus orca)
https://cdnsciencepub.com/doi/full/10.1139/cjz-2022-0161?af=R
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