Featured Post from University of Delaware

Understanding waterfowl movement and bird flu

While poultry houses are at risk, those encountering geese in neighborhoods don't need to be too concerned for themselves or their dogs, according to a University of Delaware expert

Mar 13, 2025

2 min

Chris Williams
CaptionResizeWrap TextRemove


Scores of waterfowl are currently on the move, and experts are worried they could further spread highly pathogenic avian influenza, commonly known as bird flu. But these flocks, which can number in the thousands and include Canada geese and snow geese, are of most concern around poultry houses, said University of Delaware’s Christopher Williams. The risk to humans and dogs getting bird flu from geese who inhabit their neighborhoods remains low, Williams said.


Williams, a professor wildlife ecology in UD’s College of Agriculture and Natural Resources, explained why this is happening:


• Smaller ducks such as blue-winged teal, larger ducks such as mallards, and larger geese like Canada geese and snow geese are heading north to their breeding grounds.


• Waterfowl are a primary reservoir for avian influenza viruses, meaning they can harbor bird flu strains viruses, spread them, and in some cases show no signs of disease. They can shed the virus through their saliva, naval secretions, and feces.


• Waterfowl serve as the primary vector of avian influenza to the U.S. poultry industry which has affected more than 8 million commercial and backyard chickens and turkeys that have been culled to keep the virus from spreading.


“While we are worried about these flocks congregating near poultry houses, the risk of humans getting bird flu from waterfowl remains low,” Williams said. “Further, walking dogs around areas with geese flocks should pose little threat to dogs’ health as avian influenza is very rare in dogs.”


Nevertheless, Williams cautions people and dogs to avoid touching sick birds or dead birds.


A large segment of the Canada geese population are not migratory, Williams said. They will stick around the Mid-Atlantic year-round and tend to congregate and breed near grocery store parking lots, golf courses and neighborhoods.


“Those birds are being drawn to needing two things. No. 1 is they need water including any natural pond or water containment area,” Williams said. “And all the geese species are herbivores, so No. 2 they eat grass. There are places that have both water and grass that will provide ideal nesting habitat for the geese and their chicks.”


Reporters can connect with Williams by visiting his profile and clicking on the “contact” button.

Connect with:
Chris Williams

Chris Williams

Professor, Wildlife Ecology

Prof. Williams serves as Director of the Waterfowl and Upland Gamebird Center.

ZoologyGame Bird EcologyWildlife EcologyWaterfowl EcologyBird Populations and Habitats
Powered by

You might also like...

Check out some other posts from University of Delaware

Structural Engineering Expert Available to Discuss High-Rise Building Stability, Structural Failures and Building Safety featured image

1 min

Structural Engineering Expert Available to Discuss High-Rise Building Stability, Structural Failures and Building Safety

University of Delaware structural engineering expert Michael Chajes is available to discuss the engineering challenges involved in assessing and stabilizing high-rise buildings following structural damage, structural failures and concerns about potential collapse. Chajes, a professor of civil and environmental engineering and a registered professional engineer, specializes in structural engineering, structural health monitoring and forensic engineering. He has provided expert commentary to national media outlets on major structural failures, including the Surfside condominium collapse and the Francis Scott Key Bridge collapse. His expertise is particularly relevant to the ongoing situation in New York involving a high-rise that is at-risk of partial collapse. He can discuss. • The conditions that can trigger structural instability during construction, renovation or changes in building use. • How engineers assess damaged structures and determine whether a building can be stabilized or safely repaired. • The engineering challenges involved in converting older office towers into residential buildings, including changes in structural loads, construction sequencing and temporary support systems. • How structural health monitoring and inspection technologies help engineers evaluate the safety of aging infrastructure and high-rise buildings. To arrange an interview with Chajes, visit his profile and click on the contact button. Interested reporters can also send an email to MediaRelations@udel.edu.

Post-earthquake crisis in Venezuela: University of Delaware experts available to discuss public health, infrastructure and relief featured image

1 min

Post-earthquake crisis in Venezuela: University of Delaware experts available to discuss public health, infrastructure and relief

Faculty from the University of Delaware’s renowned Disaster Research Center are available to comment on the back-to-back earthquakes in Venezuela. These experts can discuss critical infrastructure failures, public health threats, emergency logistics and community-led response efforts in the region. Available experts include: From what I’ve seen, it looks like the earthquake occurred on the boundary of the Caribbean and South American plate. A strike-slip fault similar to the San Andreas. There have been a lot of nonductile reinforced concrete frame building collapses. There may be an effect of soil given that a lot of the damage has been near the coast. Jennifer Horney (Professor of Epidemiology) Focus: Public health impacts, post-disaster waterborne/vector-borne disease outbreaks and the breakdown of healthcare delivery due to damaged roads and disrupted communication networks. Tricia Wachtendorf (Co-director, Disaster Research Center) Focus: Disaster response logistics, community improvisation, neighbors as first responders and how to donate effectively to maximize impact. Sarah DeYoung (Associate Professor, Sociology and Criminal Justice) Focus: Maternal and infant health/feeding in emergencies, pet and companion animal evacuations and community-level crisis decision-making. To contact these experts directly and arrange an interview, visit their ExpertFile page and click on the contact button. Interested reporters can also email MediaRelations@udel.edu.

From clay on the ground to construction on the moon featured image

2 min

From clay on the ground to construction on the moon

Building material samples from the University of Delaware spent six months mounted outside of the International Space Station, where the harsh conditions of low Earth orbit tested their limits. Some returned with higher measured strength than identical samples stored on Earth. The findings are a promising sign for the long-term goal of building infrastructure on the moon. There are no lunar supply yards, and transporting building materials from Earth would be prohibitively expensive. The solution may lie underfoot, in the form of lunar dust known as regolith. “Regolith is essentially a clay-like silicate material,” said Norman Wagner, Unidel Robert L. Pigford Chair in Chemical Engineering. “It is one of the most abundant materials on both Earth and the moon, which makes it interesting for construction.” Wagner's laboratory develops geopolymers, a cement alternative that binds clays into a strong solid through chemical reactions rather than high-temperature manufacturing. Their goal is to use regolith with minimal additives to produce construction materials without energy-intensive processing. The approach could contribute to more sustainable Earth-based construction, too. To evaluate how geopolymers hold up in space, the UD team sent thin plates made from commercially available simulated lunar and Martian regolith to the International Space Station as part of NASA's MISSE-20 mission. The findings, published in Advances in Space Research, showed the geopolymers did not deteriorate, and in some cases were stronger after their time in orbit. Lunar construction materials must not only survive space conditions, they also must be reliably manufactured on-site. In a separate study in Acta Astronautica, Wagner's team used artificial intelligence to tackle a practical challenge: not all lunar clays are the same. The researchers developed a machine learning model that can predict how strong a geopolymer will be based on the characteristics of the starting regolith and how it is processed. Complementary work from the Wagner lab offers insight into how geopolymers behave while being mixed, pumped and shaped before they harden. The researchers identified a key transition point, known as the critical gel point, at which the material shifts from a workable slurry into a solidifying structure. Mixing or shearing before that point did not affect how long the material took to harden or its final strength. This suggests that engineers may have flexibility in how they handle and process lunar construction materials, without compromising quality. That work appears in a special issue of the Journal of Rheology focused on materials behavior beyond Earth. To speak with Wagner about his space expertise, reach out to mediarelations@udel.edu.

View all posts
Powered by