The Blue Papua Mantis (Hierodula sp. Papua, likely to be reclassified as Pseudomantis papua) is a large, popular species in the pet trade, native to Papua New Guinea and Borneo. While many individuals are green, a blue coloration is a sought-after, though uncommon, color morph. 
 
Characteristics
Size: Females typically grow larger (9-12 cm or 3.5-4.7 inches) than males (8-9 cm or 3.1-3.5 inches).
Coloration: Color varies from green to yellow-green, brown, or blue, often depending on environmental factors like humidity during molting. The blue color is rare in captivity.
Temperament: They are known for being active, confident hunters and are generally considered docile and easy to handle, making them suitable for beginners.
Diet: They have voracious appetites and will actively hunt prey up to half their size. 
 
Care Tips
The Blue Papua Mantis is a hardy and easy-to-care-for species. 
Enclosure: A vertically oriented enclosure is necessary to allow ample space for safe molting, at least three times the mantis's length in height. Provide vertical twigs or foliage for climbing and a mesh top for hanging.
Temperature: Maintain a temperature range of 20–26°C (68–79°F), though they can tolerate a wider range of 18–30°C (64–86°F). A slight temperature drop at night is acceptable.
Humidity: Humidity levels should be between 40% and 70%. Misting the enclosure two to three times a week is generally sufficient.
Feeding:
Nymphs (L1-L2): Can be fed fruit flies.
Older Nymphs/Adults: Readily eat various live foods like green bottle flies, and cockroaches.
Frequency: Feed when the abdomen is not overly round; wait for it to thin out again before feeding to avoid overfeeding and a shortened lifespan. 
 
Scientific Clarification
The taxonomy of the Hierodula genus is currently under revision. There is a possibility that the species commonly known as Hierodula sp. Papua in the pet trade may actually belong to the genus Pseudomantis, a change that was suggested in a recent taxonomic review