Monarch life cycle; egg, chrysalis: caterpillar, butterfly
For years I’ve planted butterfly weed hoping to attract monarch butterflies. Alas, none ever accepted my invitation. About two weeks ago, I was delighted to find two plants with caterpillars. I hurried home and put them in their protective cage.
I was just in the nick of time.They had pupated by the next morning, I’ve been anxiously watching their progress and was so excited this morning to find two incredible monarch butterflies in my enclosure. I opened the cage and they’d left within the hour. I am so in hopes monarchs will find their way back here in their fall migration.
I’ve had milkweed for years but never been fortunate enough to attract a monarch butterfly. The only thing monarchs can eat is milkweed, Many times, I’ve made the rounds of garden centers hoping to find a plant laden with a caterpillar. Last week, I finally snagged two plants with the coveted caterpillars. As soon as I got them home, I tucked the plants with my little friends in the protective net enclosure I had tucked back for a lucky day.
I was so happy to have them safely home I went back a couple of times to check that they were still munching along.
Yesterday morning I found they had pupated and were attached to their little house. They should morph into butterflies in about fourteen days.
For more information check out the link and article below:
A monarch butterfly sipping nectar from swamp milkweed. | Image Details
Our beloved butterfly
With its iconic orange and black markings, the monarch butterfly is one of the most recognizable species in North America. Monarchs are particularly remarkable because they migrate each year, flying from as far as Canada and across the United States to congregate at a few forested overwintering sites in the mountains of central Mexico and coastal California. These sites are an amazing phenomenon: thousands of monarchs cluster in the trees in California, and millions of monarchs drape large swathes of forest in Mexico.
But over the past two decades, monarch numbers in North America have declined, prompting the U.S. Fish and Wildlife Service to join Tribes, state agencies, other federal agencies and non-government groups to identify threats to the monarch and take steps to conserve monarchs throughout their range.
Working together to save the monarch
As the premiere conservation agency in the United States, the U.S. Fish and Wildlife Service has the responsibility to ensure that the monarch migration phenomenon continues. It’s going to take everyone – from government agencies to individuals to ensure a future filled with monarchs. You can do your part for monarchs in your backyard, in your back forty and along every back road.
We’re “all in” on monarch conservation. And we can’t do it alone. We’re focused on increasing monarch habitat on the lands we manage and engaging with all partners on monarch conservation, including Tribes, state and federal agencies and conservation groups.
Monarch butterflies are known for their impressive long-distance migration and large clusters they form while overwintering in Mexico and coastal California. Once abundant, monarch butterfly populations have been steadily declining since the mid-1990s due to several threats. Here, you can find information about how you can help monarchs, contribute to their habitat and find resources and assistance to help guide your actions.
We’re seeking public comment on a proposed rule to list the monarch butterfly as a threatened species (4.1MB PDF) under the Endangered Species Act. The listing proposal is accompanied by a proposed critical habitat designation for the species at its overwintering grounds in coastal California and a proposed 4(d) rule that offers species-specific protections and flexibilities to encourage conservation.
According to the most recent monarch Species Status Assessment, by 2080 the probability of extinction for eastern monarchs ranges from 56 to 74% and the probability of extinction for western monarchs is greater than 95%. Threats to the species include the loss and degradation of breeding, migratory and overwintering habitat, exposure to insecticides and the effects of climate change .
This pair of bluebirds is considering taking up residence in our bluebird house. I hope we make the cut. Earlier today, three lady blue birds were fighting over the property.
We have probably had a box in this spot for fifteen to twenty years about ten feet from our back door. We only put this box here because a pair tried to nest in a hanging basket there. I’m pretty sure one pair came back as much at least five years. The last few years they raised as many as five clutches. They paid very little attention to us after the first day or so.
Bluebirds may live several years and possibly mate for life. However, this does not preclude either bird from mating with others, particularly if the Bluebird population in an area is high. Bluebird divorces may happen particularly if if first mating period is unsuccessful.
Mama bluebird usually spends about twenty minutes on the nest when laying. Papa sirs on a tree branch are rooftop guarding her. I don’t envy the constant parenting once the fledglings hatch. The parents constantly fly back and forth bring increasingly larger mouthfuls then carrying poop away.
Most Eastern Bluebirds Mate for life, But there is More to It
In this article, I explore whether Eastern Bluebirds mate for life. Bluebirds are known for their colors and soft songs, but their love lives hold some intriguing secrets. It turns out that most bluebirds mate for life, forming strong bonds that can endure as long as they survive. However, don’t let their seemingly monogamous nature fool you, as there’s more to their relationships than meets the eye.
Male and female Eastern Bluebirds. Photo: Patricia Pierce/Flickr/CC by 2.0.
Most Bluebirds (95%) mate for life, and mated pairs can stay together for as long as they survive. In the event of the death or disappearance of the male or female, the remaining bird replaces it with a new mate. Despite long-term relationships between mated pairs, studies have shown that both males and females routinely engage in extra-pair copulations. Genetic analysis of nestling bluebirds demonstrated that a male bluebird sired 20-30% of multiple broods analyzed.
Bluebird divorces may occur when a mated pair has repeated nest failures or when females attempt multiple broods with more than one male. After a divorce, the pair splits, and each bird tries with a new partner.
Only on rare occasions, one male pairs up with two females, or two males pair up with one female.
Do bluebirds mate for life?
Studies on Western Bluebirds found that most mated pairs stay together for life.
In long-term studies of Western Bluebirds’ natural history, scientists found that only about 6% of 117 pairs studied changed partners when both members of the pair were still alive.
A separate study conducted by Dickinson et al. (1996) found that only 3% of the 106 mated pairs studied switched partners. The switching of partners took place as females attempted multiple broods in a single breeding season and changed males between attempts.
Not such a study exists for Eastern Bluebirds, but field observations suggest that most bird pairs mate for life while both male and female are alive.
There is a lot we do not know about the mated life of the bluebird.
Bluebird pair formation?
Field observations indicate that many birds arrive on the breeding grounds as pairs. It appears that they begin to form pairs either while still in the wintering grounds or during the migration north when they congregate in flocks.
Field observations suggest that migratory bluebirds that are not paired upon arrival in the breeding grounds establish a breeding territory and find a mate within about a week.
Non-migratory Bluebirds generally pair up with the last year’s partner. Even though mated pairs appear not to interact very much after the breeding season, year-round resident or non-migratory Bluebirds are likely to re-mate with the same partner.
The timing of pair formation varies with latitude.
Pairs start forming first during mid-January in the warm southern states. Birds in the northern regions begin to form pairs approximately during February and March.
When is the pair bond official?
An indication that bluebirds are mated is when both the male and female interact and are seen together. But perhaps the most telling sign of pair formation is when both the male and female enter together a nesting cavity or nest box.
But whether the initial association is to remain as a breeding pair depends on additional pair interactions.
The male performs a nest demonstration consisting of bringing nesting material to the cavity. Once she enters the cavity for a first inspection of the interior, the deal appears to be sealed.
The female then accepts the demonstration and approves of the cavity, and starts bringing nesting material herself.
The male can change his mind about a female and reject her by removing the nesting material she started to bring to the nesting cavity.
If the male accepts the female as a mate, he will start offering her food as a sign of reaffirming acceptance of the breeding mate. Then they both enter the nesting cavity confirming the pair formation for the breeding season.
Copulatory Behavior
After pair formation and territory establishment, bluebirds start copulating. Mated pairs copulate for approximately eight days before the first egg is laid and continue six days after the clutch’s last egg has been laid.
The female appears to initiate a copulatory event. While perched, she crouches, keeping her back horizontal while dropping and shaking her wings and slightly cocking her tail. This action is called a female’s solicitation posture.
Eastern Bluebird copulations are seldom observed in the field.
The male mounts the female’s back and tries to make cloacal contact. Copulations generally last about 3 to 5 seconds.
Most copulations take place on perches. Although sometimes males try to mount females within the nesting cavity, these attempts are unsuccessful as females do not show interest while in the nest.
Mating for life does not mean copulating with only one partner.
Field ornithologists seldom report copulations outside the mated pair. However, genetic analysis of broods in several Eastern Bluebird populations studied showed that 20-30% of nestlings are sired by more than one male (Gowaty 1996 and Gowaty and Bridges 1991b).
This relatively high percentage of chicks sired by other males suggests that both males and females evade each other’s attention to sneak extra-pair copulations with neighboring birds.
Interestingly, this is the period when the construction of the nest and copulation are occurring, and the male keeps a close watch of the female to precisely keep her from straying and mating with another male to ensure that the brood he is going to raise is his. However, the males do the same and go around mating with other females.
This behavior is not rare among birds. Many studies have found similar behavior among several species of birds.
In areas densely populated by bluebirds where breeding territories are adjacent to each other, the percentage of nestlings sired by more than one male is higher than in areas less densely populated by bluebirds.
If breeding territories are of low quality, birds must travel outside their territories to find food.
Females in low-quality territories that traveled outside during their fertile period had more extra-pair copulations. The genetic analysis of their offspring determined this.
Mating with other birds outside the mated pair may be opportunistic rather than something sought after by the bird engaging in extra-pair copulations.
These studies took place in North Carolina, U. S., and Ontario, Canada. The wide separation between study sites suggests that the practice of extra-pair copulation is widespread across the bluebirds’ range.
The male Bluebird tries to make sure the brood is his.
Males guard their females closely during the period of high fertility, which is when the mated pair is copulating before and during egg-laying.
Interestingly, males that guard their females more closely have more young sired by other males. Perhaps these males are familiar with their mate’s tendencies to stray onto other territories. It may also suggest that males do not guard females all the time.
Another interesting fact regarding bluebird extra-pair copulations is that first-time breeders have a higher percentage of broods sired by more than one male than pairs that have been together and bred for an extended period of time.
There are limits to staying together
There is conflicting evidence on whether pairs that fail to succeed on a nesting attempt split to try again with another partner.
Ornithologists have found that most pairs that had successful nesting attempts stayed and re-nested with the same partner.
The same study also found that only 30-50% of pairs that failed on a nesting attempt stayed together and re-nested with the same partner.
Said it differently, 70 to 50% of the pairs that failed on a nesting attempt will switch partners hoping for a successful nesting attempt with another partner.
Eastern Bluebirds re-mate with another partner if one dies. Surprisingly, re-mating with another partner can happen within hours after one member of the pair’s death.
Rarely, two males form a breeding arrangement with a single female. All participants help with all breeding activities.
More than two birds in a mated pair?
The vast majority of breeding Bluebirds are monogamous. Gowaty (1980) observed 177 nesting attempts by color-banded birds. The majority of pairs (95.5%) were composed of males and females.
On rare occasions, and perhaps due to the lack of nesting cavities, two females and a male form a breeding family. The two females build the nest and lay eggs in the same nest. Both partake in the incubation of the eggs taking turns or often sitting on the eggs simultaneously.
In the case of one male and two females breeding arrangement, it is not clear if the second female or both females mate exclusively with the one male or if one female comes from elsewhere with already fertilized eggs.
Even rarer is when two males breed with a single female, as with the other breeding arrangements, all members of the family help with all breeding activities.
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