Strange Sign on Lab Door
I notice that the sign:


Doesn't quite match the other signs for scale or style
Isn't obvious in what it's communicating (unlike normal warning signs)
Looks like a monster (apparently "We Must All Stop ManBearPig" from South Park):&emsp;&emsp;&emsp;&emsp;&emsp;&emsp;&emsp;&emsp;.


I conclude that it's a joke by the museum staff, much like this "velociraptor-free workplace" sign at the Field Museum in Chicago.