Last updated: October 2026
Written by Ash and the Birdsville team. Ash lived in Port Douglas in far north Queensland, where Chestnut Breasted Mannikins nested in his back yard every summer.
The Chestnut Breasted Mannikin, also called the Chestnut Breasted Finch, Chestnut Finch or Bully Bird, is a thick set Australian finch with a grey crown, a black face, a chestnut breast with a black bar beneath it, and a golden orange rump and tail. Chestnuts are social, hardy finches that live in pairs, small parties or big flocks, and they settle well in a planted aviary. They eat a quality finch seed mix with sprouted seed, millet sprays, greens, grit, egg and biscuit and live food, and they breed in wicker nests and finch nest boxes in the warmer months. This page covers where Chestnut Breasted Mannikins come from, diet, breeding, sexing and health. Birdsville in Alexandria stocks everything you need to keep them.
Chestnut Breasted Mannikin Key Takeaways
Chestnut Breasted Mannikins are social Australian finches from the north and east coast.
They eat finch seed, sprouted seed, millet sprays, greens, fruit, grit, egg and biscuit, and live food.
Females are paler than males, but sexing them by eye takes practice.
In captivity they breed from about December to March, in wicker nests, finch nest boxes or tall grass.
Hens lay 4 to 7 white eggs that hatch in about 13 days, and pairs can raise 3 or 4 clutches a year.
Worm every 6 months, treat for mites and lice every 3 months, and treat for coccidiosis every 3 months.
Keep one mannikin species per aviary, as mannikins can crossbreed.
Birdsville Blends Finch and Canary is our recommended seed for Chestnut Breasted Mannikins.
Birdsville at 684 Botany Road, Alexandria stocks the seed, supplements and nesting supplies they need.
H2: Chestnut Breasted Mannikin Quick Facts
Scientific name: Lonchura castaneothorax
Other names: Chestnut Breasted Finch, Chestnut Breasted Munia, Chestnut Finch, Bully Bird, Barley Bird
Native range: northern and eastern coastal Australia, plus New Guinea
Habitat: reed beds, tall grasses, swamps, mangroves, cane fields and grassy woodland near water
Temperament: social and peaceful, often in large flocks
Experience level: beginner to intermediate
Clutch: 4 to 7 white eggs
Incubation: about 13 days, shared by both parents
Nestling period: about 3 to 4 weeks
Breeding season in captivity: about December to March
Clutches per year: 3 to 4
Sexing: females are paler than males
H2: Where Do Chestnut Breasted Mannikins Come From?
Chestnut Breasted Mannikins come from northern and eastern coastal Australia, and they’re also found in New Guinea.
They live in pairs and small parties, and outside the breeding season they gather in big flocks. They’re usually found in lowland areas with tall seeding grasses, reed beds, swamps, mangroves and cane fields during the wet season, and they move inland during the dry season. They’re known as Bully Birds in Australia and Barley Birds in some areas, because they love barley seed. Birds in Backyards (https://www.birdsinbackyards.net/species/Lonchura-castaneothorax) has more on Chestnut Breasted Mannikins in the wild.
H3: Seeing Chestnut Breasted Mannikins in the Wild
Ash has seen Chestnut Breasted Mannikins in flocks of up to 300 birds north of Cairns. When he lived in Port Douglas, they nested every summer only a metre off the ground in the lilly pilly trees in his back yard. They also nest in thick grass, and landscapers often brought young fledglings into the shop after cutting long grass and knocking the babies out of their nests.
H2: How Do You Tell a Male Chestnut Breasted Mannikin From a Female?
Female Chestnut Breasted Mannikins are paler than males, with a less intense chestnut breast and face colouring.
Compare several adult birds side by side, as the difference can be subtle. Young birds are much harder to sex, because they’re olive brown above and pale buff below, without the black face and chest bar of adults. If you need to be completely sure, DNA testing is the most reliable option.
H2: How Do You House Chestnut Breasted Mannikins?
Chestnut Breasted Mannikins do best in a planted aviary or a long flight cage, kept in pairs or a small colony.
They’re social, peaceful birds that mix well with other calm finches. Mannikins can crossbreed with other mannikin species, such as Yellow Rumped and Pictorella Mannikins, so it’s best to keep just one mannikin species in each aviary. A large aviary with tall grasses and shrubs lets them nest naturally, and they’ll also use wicker nests and finch nest boxes. Give them a sheltered, draught free area and plenty of perching space. Our guide to finch cages and aviaries (https://birdsville.net.au/finch-cages-aviaries/) covers aviary setup in detail.
H2: What Do Chestnut Breasted Mannikins Eat?
Chestnut Breasted Mannikins eat a quality finch seed mix, plus sprouted seed, millet sprays, greens, fruit, grit, egg and biscuit, live food and a regular vitamin boost.
Like all birds, diet affects not only their internal health but also their colour, how long they live and how well they breed.
Seed
A good quality seed mix is essential, especially if you want to breed Chestnuts. Avoid many chain store blends while it boasts vitamins etc the grain is low quality and this will effect the health of your birds. Our first choice is high quality Birdsville Blends Finch and Canary (https://petsville.com.au/products/birdsville-blends-finch-canary-500g), made fresh in store, and Basic Finch Mix (https://petsville.com.au/products/avigrain-seed-finch-blue-2kg) is a good everyday option. Be wary of supermarket mixes, which often come in fancy packaging but are poor quality. Extra seeds such as rape seed, Hulled Oats (https://petsville.com.au/products/avigrain-seed-hulled-oats-1kg) and linseed can be offered too. Our Finch Seed page (https://birdsville.net.au/seeds-grains/finch-seed/) has more.
Sprouted Seed
Sprouted seed is a great addition to the diet. Always wash it thoroughly with Vetafarm Aviclens (https://petsville.com.au/products/vetafarm-aviclens-water-cleanser-100ml) before feeding to remove bacteria. Our Best Bird Treats page (https://birdsville.net.au/bird-treats-tips-and-sprouted-mix/) explains how to sprout seed.
Millet Sprays
Finches relish millet sprays, which are fresh seed still on the stem. French white millet is the one we most recommend for finches. Hang Millet Sprays (https://petsville.com.au/products/millet-sprays-mixed-100g) in a Millet Spray Holder (https://petsville.com.au/products/jw-insight-feeder-millet-spray-holder) to keep them clean.
Greens
Greens are essential. Offer fresh seeding grasses, broccoli, endive, chickweed, dandelion, silverbeet and the flowering heads of milk thistle. Make sure anything you pick is free of pesticides.
Fruit
Offer small amounts of fruit and vegetables such as apple, pear, corn and pawpaw.
Live Food
Chestnuts eagerly eat live food such as mealworms and fly pupae. Offer it with a few pinches of Vetafarm Insectivore Rearing Mix (https://petsville.com.au/products/wombaroo-insectivore-rearing-mix-250g).
Egg and Biscuit
Egg and biscuit formula, such as Shep’s Egg and Biscuit (https://petsville.com.au/products/sheps-egg-biscuit-500g), adds extra protein and is especially important when birds are breeding.
Grit
Grit is an important source of calcium. Use a fine grit with limestone, baked egg shell, crushed cuttlebone, shell and charcoal, such as Shell Grit (https://petsville.com.au/products/shell-grit-5kg), in its own dish.
Vitamins
Every bird benefits from a regular vitamin boost. Add vitamins such as Vetafarm Multivet (https://petsville.com.au/products/vetafarm-multivet-50ml) to the water, not the seed, because finches hull their seed as they eat and the vitamins are thrown away with the husks.
How Do You Breed Chestnut Breasted Mannikins?
In captivity, Chestnut Breasted Mannikins breed from about December to March in woven wicker nests or finch nest boxes, and the hen lays around 4 to 7 white eggs.
In a large aviary they’ll also nest in tall grass and shrubs. Always supply nesting material such as Swamp Grass (https://petsville.com.au/products/breeders-delight-nesting-material-swamp-grass-50g). Both parents incubate the eggs for about 13 days, and the chicks stay in the nest for a further 3 to 4 weeks. Once they leave the nest, they still depend on their parents for food for another 3 to 4 weeks. Chestnuts can raise 3 or 4 clutches a year.
While they’re breeding, give them plenty of live food such as mealworms, maggots or fly pupae, egg and biscuit, and greens such as endive, spinach, bok choy and Lebanese cucumber as a regular part of their diet.
A Tip From Our Staff
In the wild, Chestnut Breasted Mannikins love to nest low and hidden. In Ash’s Port Douglas back yard they built only a metre off the ground in lilly pilly trees, and they also nest deep in thick grass. If your aviary has room, plant tall grasses or dense shrubs and place some nests low down among them. Many pairs will choose these over a nest box.
How Do You Keep Chestnut Breasted Mannikins Healthy?
Keep Chestnut Breasted Mannikins healthy with a varied diet, clean water every day, regular cleaning and a parasite routine: worming every 6 months, plus mite and lice treatment and coccidiosis treatment every 3 months.
Worm with a bird wormer such as Vetafarm Wormout Gel (https://petsville.com.au/products/vetafarm-wormout-gel-50ml). Spray for mites and lice with Avitrol Mite and Lice Spray (https://petsville.com.au/products/fidos-avitrol-bird-mite-and-lice-spray-125ml). Treat for coccidiosis, a common gut parasite in finches, with Vetafarm Coccivet (https://petsville.com.au/products/vetafarm-coccivet-50ml). Keep new birds apart for 2 weeks before they join your others. A finch that sits fluffed up and quiet may be unwell, so see an avian vet. Our Common Bird Illnesses page (https://birdsville.net.au/common-bird-illnesses/) lists the warning signs.
How Does Sydney’s Weather Affect Chestnut Breasted Mannikins?
Chestnut Breasted Mannikins come from warm northern Australia, so they enjoy Sydney’s summers but need shelter from cold, wet winter weather.
Their captive breeding season runs from about December to March, so late spring is the time to put out fresh nests and nesting material and to start increasing live food. In summer, make sure the aviary has shade and plenty of fresh water. In winter, keep part of the aviary fully covered and draught free.
Chestnut Breasted Mannikin Frequently Asked Questions
Are Chestnut Breasted Mannikins good for beginners?
Yes, Chestnut Breasted Mannikins are hardy, social finches that suit beginners with a planted aviary or long flight cage. Keep them in pairs or a small colony, feed a quality finch seed mix with greens, grit and some live food, add vitamins to their water and follow a regular worming and mite routine.
How do you tell male and female Chestnut Breasted Mannikins apart?
Female Chestnut Breasted Mannikins are paler than males, with less intense colouring on the breast and face. The difference can be subtle, so compare several adult birds side by side. Young birds are olive brown without the black face, which makes them hard to sex. DNA testing is the most reliable way to be sure.
What do Chestnut Breasted Mannikins eat?
Chestnut Breasted Mannikins eat a quality finch seed mix, sprouted seed, millet sprays, greens such as seeding grasses and chickweed, some fruit, fine grit, egg and biscuit, and live food like mealworms and fly pupae. Add vitamins to their water. Birdsville Blends Finch and Canary is our recommended seed for them.
When do Chestnut Breasted Mannikins breed?
In captivity, Chestnut Breasted Mannikins breed from about December to March. The hen lays 4 to 7 white eggs, both parents incubate them for about 13 days, and the chicks leave the nest after 3 to 4 weeks. Pairs can raise 3 or 4 clutches a year, so give them plenty of live food.
Where do Chestnut Breasted Mannikins live in the wild?
Chestnut Breasted Mannikins live in northern and eastern coastal Australia and New Guinea. They’re found in reed beds, tall seeding grasses, swamps, mangroves and cane fields, usually near water. They often gather in big flocks, and Ash has seen flocks of up to 300 birds north of Cairns.
Can Chestnut Breasted Mannikins live with other finches?
Yes, Chestnut Breasted Mannikins are peaceful and mix well with most calm finches in a roomy, planted aviary. Avoid housing them with other mannikin species, such as Yellow Rumped or Pictorella Mannikins, as they can crossbreed. Give plenty of feeding spots and more nests than pairs to prevent squabbles.
Why are they called Bully Birds?
Bully Bird is a common Australian name for the Chestnut Breasted Mannikin. They’re also called Barley Birds in some areas because of their love of barley seed. Other names include the Chestnut Breasted Finch, Chestnut Finch and Chestnut Breasted Munia. Despite the name, they’re peaceful birds in a mixed aviary.
Where Can I Buy Chestnut Breasted Mannikin Supplies in Sydney?
Birdsville stocks everything you need to keep Chestnut Breasted Mannikins, from finch seed and millet sprays to live food, nesting material, wormers and vitamins, at 684 Botany Road, Alexandria NSW 2015, servicing the Eastern Suburbs and Inner South Sydney. Visit us or call (02) 9669 1766, and our team will help you with diet, housing and breeding advice. We’re open 9:30am to 5:30pm weekdays, 10am to 5pm Saturday and 10am to 4pm Sunday, with directions on our Contact page (https://birdsville.net.au/contact-birdsville/). Follow us on TikTok ([ADD TIKTOK LINK]), Facebook (https://www.facebook.com/BirdsvilleRosebery/) and Instagram (https://www.instagram.com/petsvillesydney/) for live updates and finch care tips.
Keeping other Australian finches? See our Double Barred Finch (https://birdsville.net.au/[double barred finch page address]) and Long Tailed Finch (https://birdsville.net.au/[long tailed finch page address]) guides.
Petsville (https://petsville.com.au/) ships finch seed and supplies anywhere in Australia, including our Birdsville Blends Finch and Canary. Seed can’t be sent to WA or Tasmania because of quarantine laws.
Popular Chestnut Breasted Mannikin supplies on Petsville:
Birdsville Blends Finch and Canary (https://petsville.com.au/products/birdsville-blends-finch-canary-500g)
Millet Sprays (https://petsville.com.au/products/millet-sprays-mixed-100g)
Vetafarm Insectivore Rearing Mix (https://petsville.com.au/products/wombaroo-insectivore-rearing-mix-250g)
Shep’s Egg and Biscuit (https://petsville.com.au/products/sheps-egg-biscuit-500g)
Swamp Grass Nesting Material (https://petsville.com.au/products/breeders-delight-nesting-material-swamp-grass-50g)
Vetafarm Coccivet (https://petsville.com.au/products/vetafarm-coccivet-50ml)
About Birdsville
Birdsville has been at 684 Botany Road, Alexandria NSW 2015 since 1985, and we believe we’re now the oldest bricks and mortar bird shop still trading in Australia. Owner Ash brings experience from vet clinics and from the Rainforest Habitat in Port Douglas, now Wildlife Habitat. We’re a small business that does things in a big way. Nobody tells us how to run things, so we keep our products the best of the best.
Sources
Appearance, sexing, habitat, wild nesting, clutch, incubation and nestling period: Birds in Backyards, Chestnut-breasted Mannikin
Other names, range and wild diet: Wikipedia, Chestnut-breasted Mannikin
Wild observations, captive breeding, diet and parasite routine: Ash and the Birdsville team
Product details: Petsville product listings
