When it came to the children in the study, however, only the 7- to 10-year-olds were able to solve the conundrum. Logan says that this provides the strongest evidence that "the birds attend to cause-and-effect relationships by choosing options that displace more water."
However, despite the strong evidence in their favor, there is more testing to be done to determine the crow's causal cognitive processes, and whether they actually go through the same decision-making as the children in the study. Logan is optimistic, though, saying that "We don't know if the same cognitive processes or decisions are happening as with the children, but we now have evidence... (that) it's possible for the birds to pass it."
Witness more awesome crow problem-solving here!