A small dark capsule found behind a cabinet, under a sink or in a crevice may be a cockroach egg case (ootheca). A single capsule does not by itself confirm current activity, species or when it was deposited. Record what you see and where, and consider a professional assessment if other signs are present.
What is an ootheca?
An ootheca is a protective casing that holds multiple cockroach eggs. The UC IPM cockroach guide notes that oothecae, along with dark fecal spots and shed skins, are signs of cockroach activity.
The capsule is typically dark brown and ridged along one edge. Appearance varies by species and age. An empty ootheca may appear lighter and have a split seam, but a single find alone does not confirm the date, viability or species of the eggs. The case may be old or may have arrived on a moved object.
Ootheca (egg case)
Dark brown capsule with a ridged seam. Found near harbourage: behind cabinets, under sinks, in crevices.
Illustrative only. Not to scale. Shape and colour vary.
Where to check
- Behind and beneath kitchen cabinets, near the stove and under the sink.
- Inside the gap between the wall and fridge or washing machine.
- Along pipe entries, around floor traps and near drains.
- Inside stored cardboard boxes, behind picture frames and in bookshelves.
- In crevices of furniture and along skirting boards.
What an egg case may indicate
Finding an ootheca suggests cockroach activity has occurred in or near that area. However, cases can be old, transported on objects or be non-viable. A single find does not by itself confirm current breeding or the need for immediate treatment.
Multiple oothecae in one area, especially alongside droppings, shed skins or live cockroaches, are stronger indicators of established activity. A professional assessment considers the broader evidence, including the location, condition and quantity of cases found.
What to record
- A close-up photo of the capsule with something for scale.
- The exact location: which room, which surface, how deep in the crevice.
- Whether the capsule appears full (intact) or empty (split, lighter colour).
- Any other signs nearby: droppings, shed skins, live cockroaches, musty odour.
For a comparison of cockroach droppings, rat droppings and lizard droppings, see the droppings comparison guide.
Sources: UC IPM cockroach guide. This guide is general identification information; it does not diagnose a species or prescribe treatment. Checked 15 October 2026.
Cockroach Egg Cases in Singapore FAQs
How many eggs are in one cockroach egg case?
The number varies by species and the case may be old or non-viable. Each ootheca can contain multiple eggs, but a single find does not by itself confirm current breeding.
Can I just remove the egg cases myself?
Removing visible oothecae is a reasonable step, but it does not address any adults, other harbourage or eggs in inaccessible crevices. A professional assessment considers the full picture.
Does finding an empty egg case mean the problem is over?
An open or empty-looking case may be old or damaged. Its appearance alone does not establish when it was deposited or whether cockroaches remain nearby. If you see other activity signs alongside empty cases, an assessment can help clarify.
What is the difference between egg cases and droppings?
Oothecae are capsule-shaped and ridged. Droppings are smaller, irregular dark specks or smears. Both can indicate cockroach activity. See the droppings comparison guide for more detail.