Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Static Equilibrium - I01:05

Static Equilibrium - I

18.7K
A rigid body is said to be in dynamic equilibrium when both its linear and angular acceleration are zero, relative to an inertial frame of reference. This means that a body in equilibrium can be moving, but only when its linear and angular velocities are constant. A rigid body is said to be in static equilibrium when it is at rest in the selected frame of reference. The distinction between static equilibrium (e.g., a state of rest) and dynamic equilibrium (e.g, a state of uniform motion) is...
18.7K
Static Equilibrium - II01:07

Static Equilibrium - II

9.8K
Static equilibrium is a special case in mechanics that is very important in everyday life. It occurs when the net force and the net torque on an object or system are both zero. This means that both the linear and angular accelerations are zero. Thus, the object is at rest, or its center of mass is moving at a constant velocity. However, this does not mean that no forces are acting on the object within the system. In fact, there are very few scenarios on Earth in which no forces are acting upon...
9.8K
Static Friction01:18

Static Friction

1.4K
Static friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact. It plays a crucial role in our daily lives, from walking on the ground to driving a car.
For example, consider a scenario where a truck is connected to a car by a rope, ready to tow it along a road. When no external force is applied by the truck, the car remains stationary and is said to be in static equilibrium. In this case, the forces acting on the car, such as gravity and the...
1.4K
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

965
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
965
Nuclear Stability03:18

Nuclear Stability

23.0K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
23.0K
RNA Stability01:53

RNA Stability

35.7K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
35.7K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Chronic entanglement and fatal septicaemia in a juvenile bottlenose dolphin (<i>Tursiops truncatus</i>): animal welfare implications.

New Zealand veterinary journal·2026
Same author

Development of an in-home screening tool for canine periodontitis.

Veterinary journal (London, England : 1997)·2025
Same author

Real-world diagnostic potential of bacterial biomarkers of canine periodontitis.

Frontiers in veterinary science·2024
Same author

An exploration of frontline health professional's current understanding of non-fatal strangulation.

Journal of advanced nursing·2024
Same author

The Benefits of a Rapid Access Pathway for Patients Requiring Single Fraction Radiotherapy Treatment: The Cambridge Experience.

Clinical oncology (Royal College of Radiologists (Great Britain))·2024
Same author

Joint extension speed dictates bio-inspired morphing trajectories for optimal longitudinal flight dynamics.

Journal of the Royal Society, Interface·2024

Related Experiment Video

Updated: Jan 26, 2026

Flexural Rigidity Measurements of Biopolymers Using Gliding Assays
07:55

Flexural Rigidity Measurements of Biopolymers Using Gliding Assays

Published on: November 9, 2012

11.2K

Wing morphing allows gulls to modulate static pitch stability during gliding.

C Harvey1, V B Baliga1, P Lavoie2

  • 11 Department of Zoology, University of British Columbia , Vancouver, British Colombia , Canada V6T 1Z4.

Journal of the Royal Society, Interface
|April 9, 2019
PubMed
Summary

Gliding birds adjust wing shape by flexing their elbow joints. This morphing impacts flight stability, with flexed wings offering less stability than extended ones.

Keywords:
avianbiomechanicsgliding flightstatic pitch stabilitywing morphing

More Related Videos

In situ Protocol for Butterfly Pupal Wings Using Riboprobes
06:19

In situ Protocol for Butterfly Pupal Wings Using Riboprobes

Published on: May 28, 2007

11.5K
Imaging Dpp Release from a Drosophila Wing Disc
06:12

Imaging Dpp Release from a Drosophila Wing Disc

Published on: October 30, 2019

6.1K

Related Experiment Videos

Last Updated: Jan 26, 2026

Flexural Rigidity Measurements of Biopolymers Using Gliding Assays
07:55

Flexural Rigidity Measurements of Biopolymers Using Gliding Assays

Published on: November 9, 2012

11.2K
In situ Protocol for Butterfly Pupal Wings Using Riboprobes
06:19

In situ Protocol for Butterfly Pupal Wings Using Riboprobes

Published on: May 28, 2007

11.5K
Imaging Dpp Release from a Drosophila Wing Disc
06:12

Imaging Dpp Release from a Drosophila Wing Disc

Published on: October 30, 2019

6.1K

Area of Science:

  • Biomechanics
  • Avian flight dynamics

Background:

  • Bird flight stability is crucial for survival.
  • Wing morphing's effect on stability is poorly understood.
  • Gulls adjust wing shape during flight.

Purpose of the Study:

  • Investigate how gull elbow joint morphing affects static pitch stability.
  • Understand the relationship between wing shape and flight control.

Main Methods:

  • Observed freely gliding gulls.
  • Measured gull wing cadavers.
  • Tested wing configurations in a wind tunnel.
  • Measured pitching moments.

Main Results:

  • Increased wind speed caused gulls to flex elbows, increasing spanwise camber.
  • Extended elbow angles resulted in low camber and high passive stability.
  • Flexed elbow angles resulted in high camber and reduced static pitch stability.

Conclusions:

  • Gliding gulls utilize elbow joint motion to alter wing shape.
  • This single joint movement allows for a wide range of static pitch stability control.
  • Wing morphing is a key mechanism for avian flight stabilization.