The secret behind those jaws

Associated Press

Alligators locate their prey in the swamps by using nerve-packed bumps on their jaws so sensitive that they can detect ripples from a single drop of water, a study says.

Alligators have hundreds of such bumps that cover the face like a beard, said Daphne Soares, who recently finished work toward her doctorate at the University of Maryland.

Half-submerged alligators rely on the sensory array to pinpoint splashes, whether caused by a fallen hatchling or an animal stooping for a drink, Soares said.

“These are armored creatures, but they have developed this elegant way to be sensitive to their environment,” she said. Her study appears in today’s issue of the journal Nature.

Fossil evidence suggests the sensory ability emerged 200 million years ago in the ancestors of modern alligators.

Soares first noticed the honeycomb of bumps while sitting atop an 8-foot bull alligator “hog-tied and duct-taped” in the back of a pickup truck as they bounced down a Louisiana back road. She had been studying the auditory similarities alligators share with birds.

Previous research described the bumps simply as sensory organs but did not elaborate. Soares, her curiosity piqued, began studying Louisiana alligators she had flown to laboratories in Maryland and Massachusetts.

She found the nerve endings in each bump fed through the bone and led to the largest nerve in the alligator’s skull – a nerve so big she initially mistook it for a muscle.

Creating ripples in the tank where anesthetized alligators floated, half-submerged, stimulated the nerve in a way light, electricity, food and other stimuli did not, she said. When she dribbled water into the darkened tank, the alligators would lunge toward the spot.

To ensure it was the dripping that provoked the reaction, she plugged the animals’ ears with petroleum jelly. Even without hearing or seeing, and with nothing to smell, the gators would pounce repeatedly, even on a single drop.

“Once they sense a drop of water, they go toward it and bite it. Some kept biting it. They didn’t believe there was nothing there,” Soares said.

Copyright ©2002 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Talk to us

> Give us your news tips.

> Send us a letter to the editor.

> More Herald contact information.

More in Local News

Customers enter and exit the Costco on Dec. 2, 2022, in Lake Stevens. (Olivia Vanni / The Herald)
Costco stores could be impacted by looming truck driver strike threat

Truck drivers who deliver groceries and produce to Costco warehouses… Continue reading

Two Washington State ferries pass along the route between Mukilteo and Clinton as scuba divers swim near the shore Sunday, Oct. 22, 2023, in Mukilteo, Washington. (Ryan Berry / The Herald)
Ferry system increases ridership by a half million in 2024

Edmonds-Kingston route remains second-busiest route in the system.

Alina Langbehn, 6, center, and Vera A., 6, right, sit on a swing together at Drew Nielsen Neighborhood Park after school on Tuesday, Jan. 28, 2025 in Everett, Washington. (Olivia Vanni / The Herald)
Everett council votes to renovate Drew Nielsen Park

Construction on the $345,000 upgrade could start as early as this fall.

Northshore School District bus driver Stewart O’Leary pictured next to his buses shattered drivers side windshield on Friday, Feb. 14, 2025 in Bothell, Washington. (Olivia Vanni / The Herald)
‘Put me in, coach’: Bus driver back at work after struck by metal bar

Stewart O’Leary, a Northshore employee, has received national attention for his composure during a frightening bus trip.

Lynnwood councilor Joshua Binda speaks during a Lynnwood City Council meeting on Wednesday, Nov. 20, 2024. (Olivia Vanni / The Herald)
Does the Lynnwood Council VP live in Lynnwood? It’s hard to say.

Josh Binda’s residency has been called into question following an eviction and FEC filings listing an Everett address. He insists he lives in Lynnwood.

Robin Cain with 50 of her marathon medals hanging on a display board she made with her father on Thursday, Jan. 2, 2025 in Lake Stevens, Washington. (Olivia Vanni / The Herald)
Running a marathon is hard. She ran one in every state.

Robin Cain, of Lake Stevens, is one of only a few thousand people to ever achieve the feat.

People line up to grab food at the Everett Recovery Cafe on Wednesday, Dec. 4, 2024 in Everett, Washington. (Olivia Vanni / The Herald)
Coffee, meals and compassion are free at the Everett Recovery Cafe

The free, membership-based day center offers free coffee and meals and more importantly, camaraderie and recovery support.

The Everett Wastewater Treatment Plant along the Snohomish River on Thursday, June 16, 2022 in Everett, Washington. (Olivia Vanni / The Herald)
Everett water, sewer rates could jump 43% by 2028

The rate hikes would pay for improvements to the city’s sewer infrastructure.

The bond funded new track and field at Northshore Middle School on Thursday, Oct. 24, 2024 in Bothell, Washington. (Courtesy of Northshore School District)
Northshore School District bond improvements underway

The $425 million bond is funding new track and field complexes, playgrounds and phase one of two school replacements.

An American Robin picks a berry from a holly tree on Thursday, Feb. 13, 2025 in Edmonds, Washington. (Olivia Vanni / The Herald)
Calling all birders for the annual Great Backyard Bird Count

The Audubon Society will hold its 28th annual Great Backyard… Continue reading

A view of one of the potential locations of the new Aquasox stadium on Monday, Feb. 26, 2024 in Everett, Washington. The site sits between Hewitt Avenue, Broadway, Pacific Avenue and the railroad. (Olivia Vanni / The Herald)
Initial prep work for AquaSox stadium to start, with $200k price tag

The temporary agreement allows some surveying and design work as the city negotiates contracts with designers and builders.

Aaron Kennedy / The Herald
The Joann Fabric and Crafts store at 7601 Evergreen Way, Everett, is one of three stores in Snohomish County that will close as part of the retailer’s larger plan to shutter more than half of its stores nationwide.
Joann store closure plan includes Everett, Arlington, Lynnwood locations

The retail giant filed a motion in court to close approximately 500 stores in the U.S.

Support local journalism

If you value local news, make a gift now to support the trusted journalism you get in The Daily Herald. Donations processed in this system are not tax deductible.