Zoology. How Long After A Nest Is Built Does A Tree Swallow Lay Eggs And Then How Long To Hatch?

Zoology. A Bird House My Son Made Has A Set Of Tree Swallows. We Are Wondering What May Possibly Happen With These New Friends!

Zoology : How Long After A Nest Is Built Does A Tree Swallow Lay Eggs And Then How Long To Hatch

A bird house my son made has a set of tree swallows. We are wondering what may possibly happen with these new friends! ~~~ olygoalie31 ~~~

Best Answer To Zoology Question

Here are some common questions about Tree Swallows. Tree Swallows have been back for six weeks or more. Why did it take so long to start laying eggs, and why did they start laying now? * Tree Swallow eggs are small, about gm, but female swallows are small birds, averaging only 20 gm. Each egg weighs about one-tenth the weight of the bird laying it, and females lay between four and seven eggs, one per day. * Producing eggs takes lots of energy and raw materials, which comes ultimately from food females must catch. * Weather must warm up enough to allow a good supply of flying insect food in order for females to build internal resources necessary for egg production. * When females finally pass a hormonal and physical threshold their ovaries begin ripening eggs. Why don't all Tree Swallows in an area start laying the same day? * Genetic differences, and variation in foraging success, physical condition, and age, all effect individual laying thresholds. How synchronized is laying? * It varies from place to place, and from year to year, but a majority of females at a project usually begin laying within a 10 day period. They are rather well-synchronized. * There are always a few that lay outside this peak period. * There may also be late clutches following female replacement due to a death, desertion, or takeover. * Second-year (SY) females, laying for the first time in their lives, usually lay later. Why do females lay different numbers of eggs? * Genetic differences, variation in foraging success, physical condition, and age can all effect egg production. * Weather changes during laying may effect a female's ability to maintain her egg producing condition. * Resisting nest takeover attempts can drain reserves and reduce a female's ability to produce eggs. * SY females average fewer eggs than older females. Why do female Tree Swallows lay 4-7 eggs? Why not one or two? Why not10 or 12? Other bird species can have clutches these sizes. * Eggs become young that need care and feeding. There seems to be a genetically-based "best number" of young for each species, one that over thousands of years has allowed adults to leave the most descendants. * Reasons for a species' average "clutch size" have been subject of much research, but there is still debate over ultimate causes. What time of day are Tree Swallow eggs laid? * Usually about dawn or shortly after. Warning!!! During laying do not make box checks before 9:00 . Females disturbed in the act of laying could desert! How often are eggs laid? * Female Tree Swallows lay one egg per day, never more. * Bad weather may cause a female to skip a day or two. What are Tree Swallow eggs like? * Small, averaging just under 2 gm in weight. * Pure white. May appear pinkish briefly after laying. * Air space in large end. * Eggs from different females can differ in shape. Many bird eggs have camouflage markings. Why don't these? * We don't know for certain why many cavity nesters like Tree Swallows have unmarked eggs. * Tree Swallow eggs are hidden inside a dark cavity so perhaps producing eggs with cryptic markings would waste energy since predators aren't apt to see them. * On the other hand, perhaps white eggs actually are camouflaged against the background of white feathers. * Perhaps white eggs are easier for adults to see in the cavity. When do we consider that a female swallow has completed her clutch? * For our records we consider a clutch complete if there have been no new eggs for three days. If something happens to a female's eggs can she lay a second clutch? * Female Tree Swallows are "single brooded", that is they normally produce only one set of eggs per nesting season. * Females are usually capable of producing a second clutch to replace one that's been lost, but it may have fewer eggs. * If a female's first nest is predated, she usually deserts that nest site. Hope these helped... :-)

All Answers To Zoology Questions

Answer 1

Here are some common questions about Tree Swallows. Tree Swallows have been back for six weeks or more. Why did it take so long to start laying eggs, and why did they start laying now? * Tree Swallow eggs are small, about gm, but female swallows are small birds, averaging only 20 gm. Each egg weighs about one-tenth the weight of the bird laying it, and females lay between four and seven eggs, one per day. * Producing eggs takes lots of energy and raw materials, which comes ultimately from food females must catch. * Weather must warm up enough to allow a good supply of flying insect food in order for females to build internal resources necessary for egg production. * When females finally pass a hormonal and physical threshold their ovaries begin ripening eggs. Why don't all Tree Swallows in an area start laying the same day? * Genetic differences, and variation in foraging success, physical condition, and age, all effect individual laying thresholds. How synchronized is laying? * It varies from place to place, and from year to year, but a majority of females at a project usually begin laying within a 10 day period. They are rather well-synchronized. * There are always a few that lay outside this peak period. * There may also be late clutches following female replacement due to a death, desertion, or takeover. * Second-year (SY) females, laying for the first time in their lives, usually lay later. Why do females lay different numbers of eggs? * Genetic differences, variation in foraging success, physical condition, and age can all effect egg production. * Weather changes during laying may effect a female's ability to maintain her egg producing condition. * Resisting nest takeover attempts can drain reserves and reduce a female's ability to produce eggs. * SY females average fewer eggs than older females. Why do female Tree Swallows lay 4-7 eggs? Why not one or two? Why not10 or 12? Other bird species can have clutches these sizes. * Eggs become young that need care and feeding. There seems to be a genetically-based "best number" of young for each species, one that over thousands of years has allowed adults to leave the most descendants. * Reasons for a species' average "clutch size" have been subject of much research, but there is still debate over ultimate causes. What time of day are Tree Swallow eggs laid? * Usually about dawn or shortly after. Warning!!! During laying do not make box checks before 9:00 . Females disturbed in the act of laying could desert! How often are eggs laid? * Female Tree Swallows lay one egg per day, never more. * Bad weather may cause a female to skip a day or two. What are Tree Swallow eggs like? * Small, averaging just under 2 gm in weight. * Pure white. May appear pinkish briefly after laying. * Air space in large end. * Eggs from different females can differ in shape. Many bird eggs have camouflage markings. Why don't these? * We don't know for certain why many cavity nesters like Tree Swallows have unmarked eggs. * Tree Swallow eggs are hidden inside a dark cavity so perhaps producing eggs with cryptic markings would waste energy since predators aren't apt to see them. * On the other hand, perhaps white eggs actually are camouflaged against the background of white feathers. * Perhaps white eggs are easier for adults to see in the cavity. When do we consider that a female swallow has completed her clutch? * For our records we consider a clutch complete if there have been no new eggs for three days. If something happens to a female's eggs can she lay a second clutch? * Female Tree Swallows are "single brooded", that is they normally produce only one set of eggs per nesting season. * Females are usually capable of producing a second clutch to replace one that's been lost, but it may have fewer eggs. * If a female's first nest is predated, she usually deserts that nest site. Hope these helped... :-)

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