Our garage door (and every other one in the neighborhood that opens mechanically I believe) has sensors that keep it from closing in the event that anything (be it a cardboard box or a human spine) is underneath it. Why didn't the door at the zoo have them?
I don't know what the zoo has
in the gorilla night house, but the only heavy hydraulic door I know of is the one that separates the outdoor exhibit from the indoors. It functions essentially like a bulk head door sealing in the animals and sealing out the elements (and if you've ever been in SF in late Fall along the Bay/Ocean, it isn't nice). It's this door I believe that crushed Kabibe. She (at the last moment) tried to dart back outside and was pinned between the door and the jamb.
Theoretically, it should move relatively slow given the weight and because it's (probably) driven by an electric motor. If that's the case, then any sensor might not have time to kick in given the aforementioned circumstances. It's a tragic and freak accident that wouldn't have changed given the available information.
That said, a redesign of the night house would go a long way towards ensuring that this never happens again. Briefly though, turn the space just inside the house into a foyer. The gorilla troop waits here, and are brought into the actual night quarters individually or however it is deemed fit. Once inside, the internal doors are shut and after a final sweep, the outer bulkhead door is shut.
(If anybody has a better idea of what the inside of the night house looks like, please let me know. I don't think I'm far off based on the chimp's night house.)
According to
this article, zoo officials have brought Dr. Terry Maple in to investigate how and why Kabibe died.
While unrelated to the tragic event, note that the zoo recorded a profit of $1.1-million in 2013, and are sitting on cash reserves of $14-millions(!) bucks. I find that equally concerning.