Emergent Behaviour

Collective animals can communicate indirectly through the fluid disturbances their own movements leave behind. This extends stigmergy beyond persistent structures such as ant pheromone trails or termite construction.

Dodder vines may function as biological communication bridges linking otherwise separate plants through direct vascular connections. Cuscuta forms haustoria that penetrate host tissues, but those connections carry considerably more than water and nutrients.

Bumble bee colonies can reorganise from a queen-centred hierarchy into a more decentralised social network when the queen disappears. Researchers tracked more than 80 million interactions in matched queenright and queenless Bombus impatiens colonies.

Reptiles use surprisingly adaptable acoustic signals to identify individuals, synchronize group behaviour and modify messages when environmental conditions change. Male gharials produce distinctive underwater pop sequences that appear to encode individual identity, while crocodilian and turtle embryos vocalize from inside their eggs, helping siblings synchronize hatching and nest departure.

A minimal flocking model shows that a directional change initiated by one agent can propagate across an entire group at approximately constant speed through asymmetric local interactions alone.

Act I Part 1: The Game with No Player The adaptive-emergent blog has over 100 posts on swarm and natural intelligence: communication even though some of these describe the most basic microbial life.

Bird flocks achieve coordinated flight through local interactions among individuals rather than a leader directing the group’s movement. In a newly listed Oxford talk, collective-behaviour researcher Steve Portugal brings together biomechanics, physiology and social interaction to explain how birds maintain cohesion, move through complex landscapes and balance aerodynamic costs against social benefits.

Three-spined sticklebacks compensate for murky water by becoming more socially coordinated rather than continuing to use the same shoaling rules.

Researchers have developed a way to infer which neighbours an animal is actually responding to directly from collective-movement data. The method tests combinations of interaction distance and viewing angle, then measures how strongly the average heading of candidate neighbours predicts an individual’s subsequent direction.

Fish appear to switch communication channels according to how urgently their school is moving. Experiments with schools of 60 rummy-nose tetras found that fish with an intact lateral-line flow-sensing system responded to accelerating neighbours with about one-third less delay than fish whose lateral line was compromised.