Showing posts with label Amazona vittata. Show all posts
Showing posts with label Amazona vittata. Show all posts

Monday, January 10, 2011

Working on an artificial nest used by a wild pair of Amazona vittata, the Puerto Rican parrot




Ivan Llerandi Roman the leader of the wild release project, note all the equipment hanging from Ivan's utility belt

Gustavo Olivieri

An artificial nest high up in a tree

A wild female turning the eggs, they turn the eggs over every fifteen minutes on average

A baby that has just hatched is gently cupped under the wing by the female, you can see the part of the egg shell under the head of the female.  You can see the head of the newly hatched baby near the center of the photo.
Eddie Velez

The top part of the cage in the photo is about twenty feet all.
One of the more secretive aspects of the parrot project is the work that is done with the wild nests.  The reason for the secrecy is to protect the nests from unwanted human intervention which can, sad to say, include the theft of the nestlings for sale.  Unfortunately even well meaning people can cause a nest to fail if they try to approach it when the parrots are nesting.    Therefore the work of the people that manage the nests in the wild is practically unknown by the general public.  Another problem that affects the recognition of the achievements of the field workers in the area of nest management is that most of this work takes place deep in forested areas where the conditions generally are not conductive for good photography.  As a result this work is rarely documented and even more rarely described on print.  The need for artificial nests in the wild is due to the fact that for centuries and all the way up to the middle of the twenty century the main fuel for the island was wood.  As a result there was severe deforestation on many parts of the island and even on places where the forest now appears in a reasonably good health old trees are few and far between.  Also at the start of the twenty century there was a forestry theory that deemed old, hole ridden, mature trees less desirable than young trees which were still growing vigorously.  As a result in some forest areas old trees were cut down to encourage new growth. 
But in 2009 and 2010 we had the unexpected opportunity to document the work in a nest in a tree inside the aviary.  It has to be noted that the wild release staff pretty unhappy with the location of this nest.  Its location inside the aviary grounds raised all sort of issues about unintended disturbance of the breeders during our daily work at the aviary.  But they had to submit to the will of the parrot pair that signaled they wanted to nest in this particular area, and that was that.  The pair that chose this nest is the one whose male is known by the nickname “Scarface”.   The “Scarface” pair had been haunting the area around the aviary for a couple of years and had rejected or ignored all the nests that were offered in other areas.  For some reason known only to them, the pair decided that they wanted to nest inside the aviary.  Those that are old hands at the PR parrot project know that this is a startling, unheard of situation as wild nests in the east part of the island in the Luquillo mountains are in rugged, hard to get locations, well away from human habitation and the possibility of human disturbance.    But the silver lining in this particular case is that secrecy is not needed as the nest is closely, and jealously,  guarded by the staff.  The way we adapted to the presence of the breeding pair and the tolerance they showed for our rhythm of work helped bring a collective sigh of relief from everybody as from historical reports we know that Puertorican parrots nests have been abandoned over disturbances that other bird species would have ignored.
The tree where the artificial nest is located has to be prepared to receive the nest and fitted with the necessary infrastructure that allows maintenance and checking of the nest.  This particular nest has a close circuit camera that operates in the infrared region of the spectrum, this allows us to check the birds without disturbing their nesting activities.
The photos posted shows work done is 2009 and 2010.  Working with wild nests demands stamina, impressive upper level strength and the ability to work while hanging from ropes in leg and butt numbing positions.  Obviously a lack of fear of height is a must in this kind of work, you will notice that there is a large vanilla orchid on top of the nest, I have never climbed there to check that orchid out.
The nest needs to be fitted with wooden entrances to allow the birds to gnaw on the wood of the entrance, an important part of their nest choosing/preparing procedure.   The nest is also checked periodically during the breeding season to see the condition of the eggs and chicks and to band the chicks.
 To our great happiness the clutch in the nest was incubated flawlessly by the female.  The pair raised two healthy babies than on due time fledged from the nest.  I had the opportunity to observe closely and in unparalleled comfort (in relation to the experience of watching  other nests wild nests both in El Yunque and Rio Abajo) the whole breeding cycle.
I hope these photos give you an idea of the strenuous nature of this little known aspect of our work that is as crucial for the survival of the population at the Rio Abajo forest as the more widely publicized aspects of iur operation.  I would ask of all of you that if you come across a parrot nest in the wild, please do not, under any condition, try to climb the tree or disturb the parrots in any way, this will only make our work much, much harder and may make the parrots abandon the area altogether.   Another reason not to climb up to the nest is the very real possibility of falling from the tree.  Finding someone with its neck broken from a fall who has died sloooowly while being eaten alive by fire ants, centipedes and eyeball and brain gouging beetles would probably leave us inconsolable for about ten seconds after which we would have to make arrangements to drag the body out of the forest, notify the next of kin and present a nomination for a Darwin award on behalf of the dumb-as-a-doorknob deceased.
I want to add that if we notice anyone disturbing the parrots on their nesting areas we will call the local police, notify the federal government, the vigilantes of the DNER and I will personally call their mothers to tell them in no uncertain terms what horribly inconsiderate children they have.   So far we have had absolutely no problems with anyone bothering the parrots or their nests and we hope it stays this way.

Saturday, November 13, 2010

Puerto Rican parrot twilight behavior, sleeping clumped in a bunch.

This is the only photo of this behavior ever taken, you can see a parrot ready to fly away at the bottom
As the leader of the captive propagation program of the Puerto Rican parrot I spend time, probably than anyone on its right mind should, observing parrot behavior. I also read the notes of previous aviculturists about the parrot’s behavior in captivity to look for context for my observations. But there is a gap in the information about this parrot’s behavior, there’s an absolute absence of writings on what the parrots do after dark. In fact most people seem to assume that as soon as night falls the parrots go to sleep and that’s that. To say the truth this inference is largely true, however in the period of twilight before complete darkness the parrots do things that have been missed, as far as I can tell, by other observers.


The reason for missing these behaviors is very simple, after the daily work shift ends the personnel goes to their houses, to do errands, to take a nap, to eat, and hanging around the parrot cages is the last thing in (including me) anyone’s mind. But one day I noted that the period of twilight was marked by an inordinate amount of calls coming from a relatively small area in the cage, the calls denoted intense socialization at a time that I had always assumed the birds were setting down to sleep. This piqued my curiosity and I decided to see what was happening.

What I found is that sometimes, instead of sitting on the many perches on the cage, the parrots will cluster together to sleep in the wire forming a mass that resembles a grape bunch. I have never read this reported, and it doesn’t seem like they sleep in this way in the wild. The birds arrange themselves in a very tight bunch, literally side by side in a degree of intimate contact that I would have thought inconceivable between adult parrots that are not pair bonded. The forming of the bunch is accompanied by much squawking and I suspect this is caused by birds jostling each other for position on the bunch. I have never set out to watch the formation of the bunch since this would probably disrupt its formation but I have on rare occasions witnessed its dissolution. Also most of our flight cages have, by design but this is a matter for another post, odd asymmetrical shapes that limit line-of –sight viewing.  What I found most interesting about this clumping behavior is that the PR parrots, which can be quite picky with who they associate during the day, seem to lose their selectivity as night falls and join together in relative amicability and closeness that they don't show during the day.

I suspect the birds clump as a form of protection from predators. I make this inference because of what happens when the clump is disturbed. When the birds are startled the clump explodes like a grenade with birds flying in all directions. I have just a single photo of this clumping, it was taken when I had to feed the flock very early before dawn because we were doing some special work with the wild birds and I wanted the captive birds to be all fed by first light in the morning. In the photo you can see only part of the clump as a number of the birds had flown away the moment they detected movement near the cage. Nevertheless the photo shows the way the birds arrange themselves on the wire. Previously I always thought that only mated pairs slept this way.

It is unclear what triggers this behavior as some birds are quite content to sleep in perches.  For the moment being this behavior remains a curiosity observed from time to time.

Wednesday, October 29, 2008

Puerto Rican parrot, Amazona vittata, a smile of hope



One of the ten most endangered species of parrot in the world, the PR parrot is the focus of an intense effort to restore its populations. A formerly extremely abundant bird whose population was counted in the hundred of thousands if not in millions, it s wild population suffered a catastrophic decline and dwindled to 13 in the 1970's due to habitat loss and other causes. Now there are about 280 individuals and two wild populations, including a new one in the Karst region of Puerto Rico that has about twenty birds. I post this photo to invite you to think of all the species that are in jeopardy due to habitat destruction and unwise resource exploitation. Some of endangered species are superbly adapted to their enviroment but have great trouble dealing with highly unnatural pressures such as being captured for the pet market (one of the reasons for the decline of the PR parrot). I have dedicated my life to save these extraordinary creatures which are profoundly emotive, very independent and a true nightmare to breed in captivity.




There are various posts in this blog about dufferent aspects of the life and biology of Amazona vittata both in captivity and in the wild.


Para informacion en Espanol con respecto a la reproduccion en cautiverio de esta cotorra en el Aviario de Rio Abajo, puede buscar en:bc.inter.edu/focus/a4_n2/valentin_delarosa.pdf