Whooping Crane Update – Aransas National Wildlife Refuge (summary)

by Wade Harrell, U.S. Whooping Crane Recovery Coordinator

Whooping Cranes on the Refuge:

Birds are still being seen on the refuge, but the whooping crane migration is well underway and we expect that most birds will depart the coast over the next couple weeks. Based on the tracking data and incidental observations, it appears that the birds using the periphery areas of the winter range (i.e. Lamar, Granger Lake, El Campo, Welder Flats) have been the first to depart this year. Though the birds seem to be leaving in mass, they actually have staggered departures and leave in small groups. This is important as it ensures survival of the species. If they were to all leave together and encountered bad weather or some other catastrophic event, it could put the whole flock in jeopardy.

Tracking Efforts:

As of Monday, April 8, 14 of the marked birds that we are actively receiving data on were still present on the coast and 21 have begun migration. Based on this information and other observations, it is likely that greater than 50% of the birds in the Aransas/Wood Buffalo flock are currently migrating north. Of the 21 marked whooping cranes currently in migration, 14 are as far north as Nebraska and the Dakotas

Taking a look into the past as we consider the future:

The following graphic shows the expansion of wintering whooping cranes on and around the Refuge over the past 55 years (1951-2006). As we have seen this winter, this expansion has now moved to a few inland locations such as the Granger lake area. This trend gives us hope that the species will continue on the upward trend. To read the full report, click on:   http://www.fws.gov/nwrs/threecolumn.aspx?id=2147517593