I have practiced veterinary medicine in the Shelf for ten years. I treat pets — dogs, cats, the occasional bird or rodent — and I treat urban wildlife that comes to me injured, sick, or simply strange enough that someone thought a vet should look at it. What follows are selected cases from my files, presented with clinical detail and without the editorial commentary I save for my personal journal, because the cases speak for themselves.

Case 0047: Female domestic cat, approximately 4 years old, brought in by a Shelf resident who had been feeding her for two years. Presenting complaint: "She sounds like she has two heartbeats." She did have two heartbeats. Examination revealed two functional hearts — the original organ in the standard thoracic position, and a second, smaller but fully formed heart located posterior and slightly left of the original. Both hearts were beating in coordinated rhythm. The cat was asymptomatic. Both hearts were healthy. The second heart appeared to be a developmental duplicate triggered by a geneware modification — likely cosmetic in origin, possibly intended for a human recipient — that had integrated into feline developmental pathways. The cat had twice the cardiac redundancy of any natural feline. She was, cardiovascularly speaking, the most robust cat I have ever examined. I advised the owner to continue feeding her and try not to think about it.

Case 0112: Male rock dove (pigeon), found injured in Block 9. Wing fracture, standard treatment. During examination, feather analysis revealed copper integration in the rachis (feather shaft) structure — not surface contamination, but copper molecules incorporated into the keratin matrix during feather growth. The feathers had a faint metallic sheen visible under magnification. Conductivity testing confirmed the feathers were weakly conductive. The pigeon was also bioluminescent — standard blue-green breast feather presentation. The copper incorporation appeared to be independent of the bioluminescence modification. This bird was carrying at least two separate geneware modifications, neither of which was designed for pigeons. Recovery was uneventful. Released after four weeks.

Case 0198: Brown rat, male, approximately 300 grams — large for the species. Captured alive by a Shelf community board pest assessment team and brought for health screening. Genetic screening revealed markers for three separate geneware modifications: a metabolic optimization suite (originally designed for human athletic enhancement), a retinal modification (originally designed for human low-light vision enhancement), and a neural plasticity promoter (originally designed for human cognitive therapy). None of these modifications were designed for rats. All three were expressing, at varying levels, in this rat's biology. The metabolic suite had increased the rat's baseline body temperature by 1.2°C and likely contributed to its above-average size. The retinal modification status was unclear — I lack the equipment for rat visual acuity testing. The neural plasticity promoter was active. I noted this in my file and spent the rest of the evening wondering what enhanced neural plasticity does to a rat, and whether I wanted to know.

Case 0256: Mixed-breed dog, male, 7 years old, owned communally by the residents of Block 4. Presenting complaint: "He barks at the radio." More specifically, the dog reacted to radio frequency transmissions — becoming agitated when specific frequencies were broadcast from a handheld transceiver used by the owner's neighbor for community communications. Testing confirmed auditory response to transmissions in the 400–500 MHz range. The dog could hear radio. Not the speaker output — the electromagnetic transmission itself. Examination revealed no visible ear abnormalities, but otoacoustic emission testing showed cochlear responses to electromagnetic stimulation that should not produce auditory perception in any known mammal. The modification, if it is a modification, has no known origin. The dog was otherwise healthy, well-loved, and extremely good. I prescribed nothing. Some things don't need treatment. They need documentation.

These are four cases from a file that contains over three hundred. Each case is an individual animal. Each animal is a data point in a pattern so large that no single veterinarian, no single lab, no single institution can see its full shape. The wildlife of GLMZ is changing. It is changing faster than wildlife should change, in directions that nobody planned, through mechanisms that nobody fully understands. I document what I see. I treat what I can. And I note, in my personal journal, that the most honest thing a scientist can say about the state of urban biology in GLMZ is: we don't know what's happening, and we're not sure we can keep up.