As in things. Things that were already on the ship, before the first jump.

[Dammit, why don't you people understand her??]

...

[Okay she's going to try again.] We've experienced certain anomalies within the ship in the past. Some of them range from strange apparitions, black holes, to mutated creatures we've come to know as manticores -- blind but hyper-intelligent monsters that share the genetic traits of human and various animals.

Did you see the welcome manual? Because you may want to see the welcome manual. It may answer any additional questions, should help you live longer.

[Here is your memo. She's really not one to sugarcoat this shit.]