what kind of birds have blue eggs?
461442
Those with blue balls.
584664
Well I don't know a whole lot about birds - especially their cadence - but, Orioles are known to occupy Massachusetts, so is the Bay-Breasted Warbler, and the Carolina Wren, all have black body feathers and at least an orange throat or belly.\n\nHopefully that helps?
985817
yes- the eggs are not always visible
677812
I've heard of attacks by mockingbirds and bluejays and have seen both of these birds swoop on other potential predators such as cats. They only do it when they feel their nest (with eggs or nestlings) is threatened. The solution is just to stay away from the nest.
445951
A wonderful bird is the pelican,\nIts beak can hold more than its belly can.\n\n:)
866305
>>All birds are oviparous or egg-layers so I am afraid none is viviparous.\n>>Anyway, as a sort of ridddle: The peacock is a bird that does not lay eggs, it is the peahen who lays the egg.♥
119824
Biologically speaking they lay eggs in spring because the increasing day length triggers the brain to release reproductive hormones. Those hormones cause the birds to mate, which of course leads to eggs.\n\nEvolutionarily birds lay eggs in spring because summer and autumn are the times of most abundant food: insects, fruit, nuts, mice and so forth. By laying eggs in spring the young birds start flying when there is the maximum  amount of food around. That way they have a few months to learn how to hunt, find berries and so on before it becomes difficult. By the time winter comes they have become proficient at finding food, so even though there is less food around in winter they have become so good at finding it they won’t starve. If eggs were laid in winter or autumn the young would be trying to learn how to find food when food is most scarce and they would almost certainly starve before they learned.\n\nThe abundance of food in spring and summer also make sit easier for the parents to find enough food to bring back to the nest.\n\nSome people will try to tell you that birds nest in spring because they can’t keep the eggs warm in winter. Of course this makes no sense because many penguins lay their eggs right at the very beginning of winter. They do that because the maximum amount of food available in the Antarctic occurs right at the very end of winter and start of spring. By laying their eggs at the beginning of winter the penguin chicks start swimming right when the maximum amount of food is available, just as other birds start flying just when the most food is around.
1155740
egg... there are fish eggs before chicken eggs
1063260
In most birds and reptiles, an egg (Latin ovum) is the zygote, resulting from fertilization of the ovum. It nourishes and protects the embryo. Oviparous animals are animals that lay eggs, with little or no other development within the mother. This is the reproductive way of many fish, amphibians and reptiles, all birds, the monotremes, and most insects and arachnids.\n\nSince there are well over 800,000 species of insects I'd say oviparity is the way the largest number of animal species reproduce.
682404
Mountain bluebird.\n\nhttp://en.wikipedia.org/wiki/Mountain_Bluebird
46361
Female birds have usually only one functional ovary (the left one); the right-side oviduct and ovary do not develop. Exceptionally, in some groups such as falcons and eagles both ovaries are functional. \nThe ovary looks like a grape-bunch due to the immature ova it holds. Once an ovum starts to develop, it grows enormously and travels through the oviduct where it acquires its membranes and shell.
594157
Penguins are birds (Aves) in that they have feathers, lay eggs and have forelimbs modified as wings (but in this case used for swimming). They also share all the other characteristics of birds, being warm-blooded (around 40 deg C) and having a reduced reproductive system (one functional ovary or testis).\nLike all other birds, penguins have feathers. Penguin feathers are short, overlapping and densely packed. The outer part of the feather is waterproof while the inner down section traps an insulating layer of air, keeping the penguin warm in the sometimes freezing water. Unlike those of flying birds, the feathers on a penguin wing are very short.
463345
Their are 11 types of gulls.  The Herring Gull mates for life.  I am not sure of the others.
260469
The egg. In general - eggs of various species- insects, dinosaurs, etc.  had been around LONG before chickens evolved.
588446
Yes they are called birds.
721394
Mosquito or frog eggs
658786
Pigeons.\n\nSeriously.