Warning! Full SPOILERS below for Netflix’s Bird Box. You can read our spoiler-free review right here.
Bird Box really left us in the dark when it came to its monsters. Are they wraiths, specters, hallucinations, or something more sinister? While there are some details that are clearly established about the creatures, by the end of the movie, we still really weren’t sure what they were. But, we have some ideas, digging deeper into the theories brought up by Charlie (the supermarket employee, who was writing an “End of the World” novel) and some conjectures from Reddit.
We never really see how the creatures look, but Gary does draw several images of them. One drawing looks almost like the head of an octopus with slits for eyes. Gary’s sketches also show multiple legs, tentacles or tails? We counted nine of them. Bird Box Creature Designer Andy Bergholtz also posted mockups to his Instagram of what the creatures were originally supposed to look like (at least for Malorie). Bergholtz added that each victim saw a different fatal vision, and this demonic baby creature (with a CGI body added later) would have appeared in a cut nightmare scene for Malorie.
Source: IGN.com Bird Box Monster Theories Explained