Many backyard birders recognize individual birds that visit their feeders or take up residence in their bird houses, but do birds remember humans? According to Discovery News, a new study of common raven sounds and calls has revealed that the birds not only recognize humans they have interacted with previously, but they vary their calls accordingly. Familiar humans are greeted with softer, smoother vocalizations, while strangers are met with harsher, more aggressive tones.
Learning to bird by ear can help you distinguish between a bird's unique calls and subtle tones, and you just might learn how bird conversations work!
Photo © Ingrid Taylar