Migratory Whooping Crane Reintroduction

2008 Update

December 2008 Population and Fall Migration Status

As of early December 2008 there are 88 total birds in the Eastern Migratory Whooping Crane population (14 still with ultralights,74 released). All but one (Michigan bird) we know departed from their summer locations. The first significant migration movements of Fall began in late October, with the majority of birds departing between November 15-20. Our most recent information indicates the tally above (see map). Thirteen birds have not recently been located in their migration. We expect additional movements in the days/weeks ahead, although some birds have already arrived in the areas where they typically spend the winter.

2008 Ultralight Cohort

Since departing October 17, southbound progress of the14 cranes led by ultralights has been hampered by several large and persistent weather systems. Operation Migration reports that birds have flown well together and they are pleased with their new more westerly route (see map). Some birds in the 2008 cohort will winter at St. Marks National Wildlife Refuge in Florida, while others will winter at Chassahowitzka National Wildlife Refuge. As of December 3, these birds had travelled 525 miles, and were in Kentucky. For daily updates on the progress of the ultralight cohort, see the Operation Migration (exit DNR) web site.

2008 DAR Cohort

Of the seven birds released in October using the DAR technique (direct autumn release), all are currently migrating with older whooping cranes. At present, 4 birds are located in northern Illinois, 2 birds in southern Indiana, and one bird was previously lost to a predator in Wisconsin. DAR birds are reared in the field from an early age and then released into groups of older cranes from whom they can learn the migration route. This year is the fourth year that the ultralight migration has been supplemented by the release of DAR birds.

Reproduction

During 2008, there were a record eleven whooping crane nests in central Wisconsin wetlands. Unfortunately, the whooping cranes abandoned their nests after incubating eggs for several weeks. Biologists were able to successfully collect eggs from several of the abandoned nests and three chicks from the rescued eggs hatched in captivity. These bonus birds are now members of the 2008 cohort following the ultralights south to Florida. Scientists are still speculating as to why the cranes abandoned their nests. More intensive monitoring and research are being planned for next year’s nesting season.