The discovery in Monterrey, the capital of Nuevo Leon, was the result of a joint investigation by Profepa and the Attorney General's Office.

Officers found a freezer containing 40 dead animals, among them 17 python regius snakes, two sugar gliders (Petaurus breviceps), two eastern grey squirrels (Sciurus carolinensis), two black-tailed prairie dogs (Cynomys ludovicianus), one squirrel monkey (Saimiri sciureus) and one cotton-top tamarind (Saguinus Oedipus).

They also found one parrot (Psittacidae), two common kestrels (Falco tinnunculus), three water monitor lizards (Varanus salvator), two swamp crocodiles (Crocodylus moreletti), four Burmese pythons (Python bivittatus), one corn snake (Pantherophis guttatus) and red-eyed tree frogs (Agalychnis callidryas).