The first names of the two women who come through the anomaly are the same as the two better known sisters of the literary Brontë family.
The Tree Creepers are most likely a product of speculative convergent evolution; theorising what a highly-advanced dromaeosauridae (commonly known as either "deinonychosaurs" or "raptors") would look like if it lived the arboreal lifestyle of a tree-climbing primate and how it would behave in a similar manner to modern simians, resulting in what appears to be a forest-dwelling theropod (bipedal dinosaurs) with an extremely monkey-esque body-shape.