[David's clawing furiously at the bars of his cage, making little scrabbling noises from where it's draped over in the corner. Rats have excellent hearing, but in his hysteria it takes him a few minutes to recognize Claire's voice. When he does, he falls silent - instantly. He stops clawing at the bars and instead burrows under the wheel, under the shavings so that if Bourne decides to whip the cover off his cage in a dramatic reveal (as David fully expects him to do) at least he'll be hard to see.]