Cardinal eggs are small, oval, and pale greenish-blue with brown or grey speckles. The female lays 2-5 eggs per clutch, incubates them for 11-13 days, and can produce 2-3 clutches per breeding season.
At a Glance
| Feature | Details |
|---|---|
| Colour | Pale greenish-blue with brown/grey speckles |
| Size | About 2.5cm (1 inch) long |
| Shape | Oval |
| Clutch size | 2-5 eggs |
| Clutches per year | 2-3 (up to 4 in warm climates) |
| Laying season | February to September |
| Incubation period | 11-13 days |
| Who incubates | Mostly the female; male brings food and occasionally sits |
| Egg laying rate | One egg per day until clutch is complete |
| Nest location | Dense shrubs or trees, 1-3 metres above ground |
The Timeline
| Day | What happens |
|---|---|
| Day 1-5 | Female lays one egg per day |
| Day 1-13 | Female incubates; male brings food and guards territory |
| Day 11-13 | Eggs begin hatching |
| Day 13-26 | Chicks in nest, fed by both parents |
| Day 20-26 | Chicks fledge (leave the nest) |
| Weeks 3-8 | Parents continue feeding fledglings outside nest |
Courtship and Mating
The male cardinal courts the female by bringing her food - a behaviour called mate feeding. He picks up a seed or insect, hops to the female, and places it in her bill. If she accepts, the pair bonds. Cardinals typically mate for life and return to the same nesting territory each year.
Why Eggs Get Abandoned
Predator disturbance - Snakes, squirrels, blue jays, and crows raiding the nest repeatedly will cause parents to abandon.
Human interference - Approaching the nest too frequently or disturbing surrounding vegetation.
Unviable eggs - If eggs show no development after the normal incubation period.
Extreme weather - Prolonged rain, wind, or temperature extremes.
Nest damage - Structural failure from storms or poor construction.
If you find abandoned cardinal eggs, do not touch them. The parents may still return. If you are certain they are abandoned, contact a local wildlife rehabilitator.
Nest Predators
| Predator | Threat level |
|---|---|
| Snakes | High - climb into shrubs to eat eggs and chicks |
| Blue Jays | High - raid nests for eggs |
| Crows | Moderate - opportunistic nest raiders |
| Squirrels | Moderate - eat eggs when found |
| Cats | High - major threat to nesting birds |
| Raccoons | Moderate - nocturnal nest raiders |
Cardinals do not reuse nests or move eggs. If a nest fails, they build a completely new one at a different site and start again. A pair may attempt 2-4 nests per season until one succeeds.
