Yes, it is not unusual for robins to have two clutches a season.
More than one brood may be raised in Southern areas in one season.
In the deep south, two broods may be raised in a season.
The species is double brooded in the South.
Both are passerine birds, both build nests in trees and shrubs. Other than that, they are very different. Blue jays are Corvids, related to ravens and crows. Robins are thrushes.
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Blue eggs may be more camouflaged in green foliage than white eggs. Also, eggshells with blue pigments in them are stronger than white eggshells, so more survive to hatch. Pigments may also offer some protection from UV light, which could cause mutations in the developing embryo.
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Robins normally nest only once a year in most of their range.But in the southern parts of their range,two broods may be raised.The robin may nest again in northern sections of the country if the first nest is destroyed or the eggs taken by predators.
Robins usually have lay 4 eggs and then stop. They rarely have more and it is said that if one sees more than 4 eggs that another robin probably laid them in the "borrowed" nest. I have at this moment, though, a nest with 6 ! baby robins in it. All 6 look as if they are ready to fly.
The species is double brooded in the South.
Yes they can!
Yes, a duck can lay eggs more than one a year. I have ducks and chickens that lay eggs daily. (I know that some birds, if their eggs are damaged or ruined in the early stages of nesting, will lay more eggs, most often in a different nest location. Robins and pigeons do it all the time...well, each spring, anyhow). most birds can do it from 1-4 times per year. In the wild, birds lay eggs twice a yr.(House Wrens will build as many nests as they can before the season changes.)
No. But you can get two eggs fertilized at the same time.
In some areas, like in the south, robins are double brooded, but build a new nest for the second brood.
Robins! Robins! Robins!
There are several species of birds other than robins that lay blue eggs. Bluebirds lay blue eggs, as well as starlings and house finches.
Fish are like humans, they (most of the time) give birth (lay an egg-s) once.
They are the size of your thumb and they are blue. They're A bit smaller than your thumb. And they're light blue.
A woman does not normally release more than 1-2 eggs at once. The reason for twins is often that these 1-2 eggs might divide into more after they are fertilized. 2 eggs can become triplets or quadruplets or even more. Normally there are fertility medicine at work when a woman release more eggs. Factors at work can also be chemical spills or waste problems that by a freak of nature causes women to release more eggs and sometimes have many babies in one go.