How to Identify a Cockroach
Start with the whole insect rather than one mark. Cockroaches generally have a broad, flattened body, long thread-like antennae, six legs with visible spines, and a pronotum that partly covers the head when viewed from above. Nymphs resemble smaller wingless adults, while newly moulted individuals may appear pale until the outer covering darkens.
- View the body from above and note whether it is flattened and oval rather than rounded or hard-shelled.
- Compare antenna length, leg spines, wing length, and markings immediately behind the head.
- Estimate size with a coin, ruler, or another familiar object without touching the insect.
- Record whether the insect was alive, shed skin, a nymph, or an adult with developed wings.
A single blurred image or a dark moving insect is not enough for certain species identification.
German Cockroach and Oriental Cockroach: Key Differences
German and Oriental cockroaches can be separated by a combination of size, colour, markings, wing form, and the conditions around the sighting. The comparison below is an identification aid, not a claim about which species is most common in Tbilisi. A clear specimen or several photographs may be needed when the insect is immature.
German cockroach
Blattella germanica
- Appearance
- A relatively small, tan to light-brown adult with two dark parallel stripes on the pronotum behind the head.
- Useful context
- Identification references often associate it with warm, protected cracks near food, water, appliances, and building services.
Oriental cockroach
Blatta orientalis
- Appearance
- A larger dark-brown to almost-black cockroach. Adult males have wings shorter than the body; adult females have much shorter wing pads.
- Useful context
- Identification references often associate it with cool, dark, damp places such as basements, drains, service voids, and ground-level areas.
This page does not rank cockroach species in Georgia. Local prevalence requires location-specific survey evidence.
Signs of Cockroaches in a Property
Signs of cockroaches are more useful when several types of evidence occur in the same area. Live insects, small dark droppings, egg cases, shed nymph skins, and repeated night-time activity may justify a closer inspection. Marks alone can be confused with dirt, food debris, moisture damage, or evidence from other insects.
Where Cockroach Signs Are Often Found
Inspect edges and concealed junctions rather than only open floor areas. Cockroaches tend to use narrow shelter close to food, moisture, warmth, or protected movement routes. The room helps guide the search, but it does not prove the species because insects can move through pipe gaps, wall voids, doors, deliveries, boxes, or adjoining spaces.
Kitchen and food storage
Check behind and beneath appliances, cabinet joints, sink plumbing, bins, dry-food storage, and cardboard packaging.
Bathroom and utility areas
Inspect pipe penetrations, drains, damp gaps, washing-machine areas, service shafts, and spaces beneath fixtures.
Basement and ground level
Look along drains, wall-floor edges, service entrances, storage clutter, and damp sheltered voids.
Commercial food areas
Document activity near equipment, delivery packaging, storage edges, waste points, and connected service routes without moving unsafe machinery.
What Can Be Mistaken for a Cockroach?
Ground beetles, longhorn beetles, crickets, some true bugs, and other dark insects can be mistaken for cockroaches, especially in a blurred night-time photo. Check whether the body is flattened, whether the forewings are hard like a beetle's, how the head sits beneath the pronotum, and whether the antennae and spiny legs match cockroach features.
- Beetles usually have hardened forewings that meet in a clear straight seam along the back.
- Crickets often have enlarged hind legs adapted for jumping and a different body outline.
- A nymph may lack developed wings and can look different from the adult shown in identification photographs.
- A crushed, pale, newly moulted, or partial specimen may require professional examination.
How to Photograph Cockroaches for Identification
A useful identification set includes a sharp close view, a wider photograph showing the exact location, and a safe scale reference. Add the estimated size, room, floor level, time of activity, and number observed. Photograph droppings, egg cases, or shed skins separately rather than placing them together or handling the specimen.
- 1
Take a clear top view showing the body, pronotum, wings, and antennae.
- 2
When possible, add a side view without touching or trapping the insect by hand.
- 3
Include a coin or ruler nearby for scale only when it can be done safely.
- 4
Photograph the wider location and any nearby droppings, skins, or egg cases.
- 5
Note when, where, and how often the activity was observed.
Do not touch an unknown insect, move heavy appliances, open electrical equipment, enter unsafe service spaces, or approach pesticide residues to obtain a photograph.
Related Identification and Service Information
Use the pest library when the insect is still uncertain, the service page when cockroach activity is established in a Tbilisi property, and the general identification guide when you need to collect better evidence.