‘Poe reviewed the first four chapters of Dickens’ Barnaby Rudge for Graham’s Magazine, predicting the end of the novel and finding out later he was correct when he reviewed it again upon completion. He was particularly taken with one character: a chatty raven named Grip who accompanies the simple-minded Barnaby. Poe described the bird as “intensely amusing,” points out Atlas Obscura, and also wrote that Grip’s “croaking might have been prophetically heard in the course of the drama.”
It chanced the following year the two literary greats would meet, when Poe learned of Dickens’ trip to the U.S.; he wrote to the novelist, and the two briefly exchanged letters (which you can read here). Along with Dickens on his six-month journey were his wife Catherine, his children, and Grip, his pet raven. When the two writers met in person, writes Lucinda Hawksley at the BBC, Poe “was enchanted to discover [Grip, the character] was based on Dickens’s own bird.” …’
Source: Open Culture