Tiziri.

Large, wide, set very low on the skull, with pink insides. Behind that design is an anatomical rarity: the sand cat has tympanic bullae — the bony hearing chambers of the ear — proportionally larger than those of any other felid, and with that kit it can pinpoint a rodent moving several centimeters under the sand without ever seeing it. None of that comes across from a wall, of course. What you do get is the broad face, the white cheeks, the pale green eyes, and the long whiskers.

Tiziri hunts water leaks in an urban network. Before she measures anything, she crouches in the middle of the road, presses her open hand flat against the asphalt, and says nothing for a long while. At the edge of her sector there's a patch of waste ground littered with rubble, with no pipe running through it; she stops there for a minute every night and has never explained what she's listening for. That wool coat isn't regulation issue, and she wears it anyway. The chain was her mother's, who gave it to her in a plastic bag one day she stopped by to drop off some clothes.