Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Optimal Foraging

Optimal Foraging

How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.

Mate Choice

Mate Choice

Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.

Conservation of Declining Populations

Conservation of Declining Populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.

Limits to Natural Selection

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.

Equilibrium and Balance

Equilibrium and Balance

The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...

Rigid Body Equilibrium Problems - II

Rigid Body Equilibrium Problems - II

A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?

You might also read

Related Articles

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

Sort by

Same author

Lineage topology, replication kinetics and cell cycle synchronization reveal regulated growth dynamics in human bone marrow stromal cell colonies.

Scientific reports·2026

Same author

Impact of climate, air pollution, and urbanization on chronic respiratory infections.

Expert review of respiratory medicine·2026

Same author

Inferring Resource Competition in Microbial Communities from Time Series.

PRX life·2026

Same author

Paraplume: A fast and accurate antibody paratope prediction method provides insights into repertoire-scale binding dynamics.

PLoS computational biology·2026

Same author

Theoretical limits for sensing through phase separation.

Proceedings of the National Academy of Sciences of the United States of America·2026

Same author

Multimodal MRI of episodic cluster headache reveals frontal cortical alterations and network-level connectivity changes.

The journal of headache and pain·2026

Same journal

Simple input-output dependencies explain neuronal activity.

Nature physics·2026

Same journal

Scaling and self-similarity in the formation of the embryonic epigenome.

Nature physics·2026

Same journal

Adhesion-driven rigidity transition decoupled from density-driven jamming triggers epithelial organization in embryonic tissues.

Nature physics·2026

Same journal

The local mechanostructural properties of protein cargoes regulate nucleocytoplasmic transport.

Nature physics·2026

Same journal

Squeezing, trisqueezing and quadsqueezing in a hybrid oscillator-spin system.

Nature physics·2026

Same journal

Noise-induced shallow circuits and the absence of barren plateaus.

Nature physics·2026

See all related articles

Search research articles

Related Experiment Video

Updated: Mar 10, 2026

Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern

Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern

Published on: March 8, 2020

Local equilibrium in bird flocks.

Thierry Mora¹, Aleksandra M Walczak², Lorenzo Del Castello³

¹Laboratoire de physique statistique, CNRS, UPMC and École normale supérieure, 24, rue Lhomond, Paris, France.

|December 6, 2016

Summary

This summary is machine-generated.

Animal flocking behavior exhibits global order from local interactions. New methods reveal bird alignment is faster than network changes, supporting statistical physics applications in active systems.

More Related Videos

Age-dependent Dynamics of Locomotion in Caenorhabditis elegans: A Lyapunov Exponent Analysis

Age-dependent Dynamics of Locomotion in Caenorhabditis elegans: A Lyapunov Exponent Analysis

Published on: September 23, 2025

Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats

Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats

Published on: June 17, 2020

Related Experiment Videos

Last Updated: Mar 10, 2026

Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern

Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern

Published on: March 8, 2020

Age-dependent Dynamics of Locomotion in Caenorhabditis elegans: A Lyapunov Exponent Analysis

Age-dependent Dynamics of Locomotion in Caenorhabditis elegans: A Lyapunov Exponent Analysis

Published on: September 23, 2025

Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats

Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats

Published on: June 17, 2020

Area of Science:

Collective behavior
Statistical physics
Animal dynamics

Background:

Flocking in animal groups demonstrates global order arising from local interactions.
Active systems, unlike ferromagnetic systems, involve dynamic rearrangement of interaction networks.
The impact of this dynamic network on biological systems requires further experimental investigation.

Purpose of the Study:

To develop a novel dynamical inference technique for analyzing flocking behavior.
To overcome limitations of slow experimental sampling rates and network rearrangements.
To infer the strength and range of alignment forces in starling flocks.

Main Methods:

Introduced a novel dynamical inference technique based on the principle of maximum entropy.
Accommodated network rearrangements within the inference method.
Overcame challenges posed by slow experimental sampling rates.

Main Results:

Local bird alignment occurs on a significantly faster timescale than neighbor rearrangement.
Equilibrium inference, assuming a fixed network, yielded results consistent with dynamical inference.
Bird orientations were found to be in a state of local quasi-equilibrium.

Conclusions:

The rapid timescale of bird alignment supports the applicability of statistical physics to active systems.
Local quasi-equilibrium over the interaction length scale validates theoretical models.
This study provides a robust framework for analyzing dynamic interaction networks in biological collectives.