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How do you identify a robin egg?

Robins are one of the most familiar and beloved songbirds in North America. With their bright red breasts and cheerful songs, they are a delight to observe in backyards and parks. An important part of robins’ life cycle is building nests and laying eggs. Identifying a robin’s egg can be a fun way to observe nature and learn more about these common birds.

What do robin eggs look like?

Robin eggs are a distinctive light blue color. The shade can vary from a pale, icy blue to a bright sky blue. They often have small brownish speckles or blotches, although some eggs can be immaculate with no markings at all. Robin eggs are ovate in shape. They are approximately 1 – 1 1⁄4 inches long and 3⁄4 – 1 inch wide at the widest point of the egg.

Where are robin nests located?

Robins build nests in a variety of locations, but often favor trees, shrubs, gutters, or ledges on man-made structures. They prefer a site that is elevated off the ground and hidden from view by foliage or other concealment. Robins are adaptable nesters and have been known to build nests in old flower pots, farm equipment, outdoor furniture, and more. The nest is an open cup built from grasses, twigs, paper fibers, and mud. It is lined with fine grasses and feathers.

When do robins lay eggs?

The robin breeding season varies across North America depending on latitude and climate. In southern areas, it may begin in February or March. Further north, egg laying typically begins in April or May. Most robins raise 2-3 broods over the course of the breeding season. Within a brood, a clutch is usually 3-5 eggs that are laid one per day. The female incubates the eggs for about 12-14 days before they hatch.

How many broods do robins have?

Robins are prolific breeders and commonly have 2-3 broods per breeding season. After successfully raising one brood, the pair will often build another nest and produce another clutch. The timing overlaps such that they may be incubating the next brood while still feeding nestlings from the first. With multiple broods, one pair can produce up to 15 young per season.

What is the incubation period?

Once the entire clutch of 3-5 eggs is laid, the female robin incubates them for 12-14 days until hatching. She sits tightly on the eggs, rarely leaving them unattended. The male feeds the female while she incubates. He may also briefly sit on the nest to allow her to take short breaks to eat and preen herself.

Do both parents incubate the eggs?

Only the female robin incubates the eggs. However, the male may briefly sit on the nest occasionally to give the female a chance to take a break. This allows her to eat, drink, and preen her feathers. But the bulk of incubating duties fall to the female. She develops a brood patch, where feathers are shed from her belly to transfer heat more efficiently to the eggs.

How do you tell if the eggs are fertile?

It can be difficult to tell if robin eggs are fertile without advanced candling techniques. A few possible signs include:

  • Observing the parents taking turns incubating the eggs
  • Noting the female leaving the nest for brief periods to eat
  • Seeing both parents vigorously defending the nest from predators or other disturbances

However, the only surefire way to confirm fertility is by waiting for the eggs to hatch after the incubation period.

What color are baby robins when they hatch?

Newly hatched baby robins are completely naked, with no feathers. Their skin is pinkish in color. Their eyes are closed at first. Within a few days, their skin darkens to a gray color as feather quills begin emerging under the surface. After a week, visible feathers start growing in.

Do robins use the same nest for second brood?

Robins typically build a new nest for each brood, even if it’s in the same general area as the previous one. However, they are known to occasionally reuse a nest for a second brood. This is more likely if the first brood was successful and there wasn’t excessive damage to the original nest. But building a brand new nest for each clutch is more common.

How often do robins lay eggs?

During the breeding season, robins lay eggs frequently. They produce 1 clutch per nest, with 3-5 eggs laid at intervals of 1 per day. After those eggs hatch and the young fledge in about 2 weeks, the pair will often build another nest for a second brood and repeat the process.

Each brood may be spaced a few weeks apart. With 2-3 broods per season, ROBINS ARE LAYING EGGS OFF AND ON FOR MONTHS from spring through summer.

Do robins reuse the same nest?

It is uncommon, but possible, for robins to reuse the same nest for multiple broods in one season. More often though, they build a new nest for each clutch of eggs, even if it’s in the same tree or location. Reasons for building a new nest each time may include:

  • Structural damage and wear to the old nest
  • Parasites lingering in the nest from the previous brood
  • Lack of time needed to repair and relined the existing nest
  • Benefits of a newer, sturdier nest structure

So while robins may occasionally reuse a nest, it is more typical for them to construct a completely new nest for each set of eggs laid.

How can you tell if robin eggs are fertilized?

It can be challenging to determine if robin eggs are fertile without using specialized candling equipment. However, there are a few possible signs that eggs have been fertilized:

  • Observing the female robin incubating the eggs constantly
  • The female leaves the nest briefly and regularly to eat
  • Both parents are behaving territorially and defending the nest
  • Seeing the shape and size of embryos inside the egg when candling

Waiting for the eggs to hatch is the only sure way to confirm they were fertilized. Unfertilized eggs will simply not hatch after the typical incubation period.

What is a robin’s clutch size?

The typical clutch size for robins is 3-5 eggs. The female lays one per day until the clutch is complete. Having more than 5 eggs is uncommon. Less than 3 eggs may indicate an issue with the parents, weather, food supply, or other environmental factors impacting breeding.

Do robins hatch their eggs in the same order they were laid?

Yes, robins eggs within a clutch tend to hatch in the order they were laid. The first egg laid will be the first to hatch, about 12-14 days after being laid. The last egg laid will be the last to hatch. This age difference gives the earliest hatchlings a slight head start on growth and development.

How can you identify a robin’s nest?

Some key ways to identify a robin’s nest include:

  • It is an open cup made of grasses, twigs, feathers, and mud
  • Often located up off the ground in a shrub, tree, ledge, or manmade structure
  • Neatly woven bowl shape with smooth interior
  • Diameter of 4-6 inches across
  • Lined with fine grasses and sometimes feathers

Look for nests in sheltered spots with good cover from foliage or overhangs. Be cautious around active nests and do not disturb them once eggs have been laid.

What is the incubation temperature?

Robins maintain an incubation temperature of approximately 100 degrees Fahrenheit while sitting on the eggs. The eggs must be kept at the proper warmth and humidity for normal embryonic development. The female’s body heat provides this. If she leaves the nest, eggs are still insulated by the nest itself.


Identifying robin eggs is rewarding for birders and nature lovers. Understanding where robins nest, their egg characteristics, breeding behaviors, and nesting timelines allows you to discover these beautiful light blue eggs. Being able to recognize and observe robin nests comes with responsibility to not disturb the sensitive incubating and nesting processes. Robins provide enjoyable wildlife viewing and learning opportunities for people of all ages.