When a vampire bat died just 19 days after giving birth, another female bat adopted the orphan. Researchers documented the unusual relationship in a new paper in the journal Royal Society Open Science, As part of a study on cooperative relationships, researchers combined three groups of wild-caught common vampire bats into one captive colony at the Smithsonian Tropical Research Institute in Gamboa, Panama. They noticed that two unfamiliar and unrelated female bats slowly formed a social relationship. The researchers named them Lilith and IBID.
Humpback whales protect other animals from killer whales, but nobody knows why. There are numerous documented cases of humpbacks actively seeking out orcas and sabotaging their attempts to hunt prey, sometimes literally carrying the victims to safety, but researchers aren't sure why the whales would put themselves in such danger when it gives them nothing in return.