A couple of interesting ornithological studies:
Like elephants, could it be that crows never forget a face, and learn to recognise threatening (and, conversely, rewarding) humans from both parents and others in their flock?
Crows and their relatives â€” among them ravens, magpies and jays â€” are renowned for their intelligence and for their ability to flourish in human-dominated landscapes. That ability may have to do with cross-species social skills. In the Seattle area, where rapid suburban growth has attracted a thriving crow population, researchers have found that the birds can recognize individual human faces.
More interestingly (amazingly?) could crows be the first non-human animal to use casual reasoning to solve problems, including chimps?
For more corvid intelligence, see Joshua Klein’s TED Talk on the intelligence of crows.