Calliphora stygia, commonly known as the brown blowfly, or rango tumaro in Māori, is a species of blow-fly that is found in Australia and New Zealand.

[2] Regardless of the environment a body is in, adult C. stygia will lay eggs in any, and all orifices such as, but not limited to eyes, nose, mouth, and wounds that occur before and after death.

[2][7] Also the presence of drugs can affect the succession rate and relative age on any insects feeding on the flesh of the corpse.

[4] It s unclear as to why exactly C. stygia is not affected by the drug though it has been consumed by the from, which came from the fly's food source, when most other insects show severe impairments in larval development.

Since methamphetamines are toxic to C. stygia most flies die in the pupal stage, it is difficult to make proper identifications.

[4] In the larval stage, it is very difficult to determine the species; most entomologists wait until the adult emerges to identify specimens.

Due to their main source of food, C. stygia bioaccumulate toxins and heavy metals that may be present in the flesh.

These flies are capable of emerging in the absence of those cues, and this is thought to be done with circadian rhythms that are set during the last instar before pupation.

Adults tend to produce equal proportions of male and female offspring,[1] and are capable of laying eggs all year round.

Their chemosensory sensilla, which have their olfactory neurons are primarily located at the tips of their antennae, as well as on their maxillary palps, aid in their hunt for food sources.

The DNA and RNA sequences for olfaction receptors in C. stygia are more similar to those found in the Lepidopteran order than other Dipterans.

[12] Calliphora stygia is believed to have recently speciated less than one million years ago, making it a relatively new species.

Upon picking up the secretion the fly will increase grooming, which may lead to ingestion, the motor, sensory, and respiratory functions may be impaired.

During spring their maggots develop from carcasses, but over summer their numbers drop as temperatures rise and other species such as C. albifrontalis dominate.