Blue jays and crows may sound similar because they both belong to the same family of birds, known as Corvidae. The Corvidae family includes a diverse group of intelligent birds that share certain vocalizations and communication patterns.
Both blue jays and crows are known for their loud and raucous calls. They have a wide range of vocalizations used for various purposes, such as establishing territories, warning of potential threats, or communicating within their social groups. Some of their vocalizations may indeed sound similar to our ears.
It's important to note that individual birds within each species can also have unique variations in their calls, so not all blue jays or crows will sound exactly the same. However, their membership in the Corvidae family can contribute to similarities in their vocalizations and communication behaviors.