Camponotus pennsylvanicus
Temperature
20–26 °C
Humidity
50–70%
Colony size
2,000–10,000
Queen size
15–18 mm
Worker size
6–14 mm
Hibernation temp
6 °C
Diet
Care Guide
Camponotus pennsylvanicus, commonly known as the eastern black carpenter ant, is one of North America’s most iconic ant species. Queens are large and impressive, measuring 15–18 mm, while workers display a gentle size variation from 6 mm minors up to 14 mm majors. Despite their size, these ants are calm and deliberate, making them a perfect first colony for new keepers who want to observe a truly representative Camponotus species. Colonies can grow to several thousand workers, offering a satisfying long-term project without overwhelming space requirements.
Their founding type is claustral, meaning the queen raises her first brood entirely on her own reserves, sealed in a small test tube or chamber. This makes the early stage exceptionally low-maintenance. Once workers arrive, the colony’s diet is straightforward: they eagerly accept a mix of protein-rich insects (crickets, roaches, mealworms) and carbohydrates in the form of sugar water or honey water. A drop of honey or diluted honeydew syrup will be met with genuine excitement. They are not picky and will thrive on a simple rotation of fresh food.
Care difficulty
Keeping Camponotus pennsylvanicus is remarkably easy, even for complete beginners. Their resilient nature and forgiving humidity requirements mean small mistakes rarely lead to disaster. The most important factor to remember is their need for a proper winter diapause. These ants require a hibernation period at around 6°C for several months each year. Skipping this will eventually weaken the colony and prevent normal brood production. With that single seasonal adjustment, everything else runs smoothly.
Housing
A standard test tube setup works perfectly for founding and early growth. As the colony expands, a formicarium with moderate-sized chambers and a separate foraging area is ideal. Maintain a temperature range of 20–26°C; room temperature is generally fine, though a gentle heat cable along the nest side can encourage brood development. Humidity should be kept between 50–70%, easily achieved by moistening the nest substrate or using a water reservoir. Because these ants are nocturnal, provide a dark, quiet nesting area with a red filter or cover. They are not aggressive, but they do appreciate stability — avoid frequent vibrations or bright light directly over the nest.
First days after purchase
Upon receiving your Camponotus pennsylvanicus colony, transfer the queen and any brood into a clean test tube setup if not already provided. Place the tube in a quiet, dark location with minimal disturbance. Do not attempt to feed them immediately; the queen can go weeks without food. After a few days, offer a small drop of sugar water on a piece of clean foil in the foraging area. Observe from a distance, and resist the urge to check daily. Within a week, you should see the first workers tending to the queen and brood. From there, the colony will grow steadily, rewarding your patience with vigorous foraging and the quiet satisfaction of watching a new generation of carpenter ants take over the nest.