A gratifyingly reliable baby-calmer is to play mandolin for them. It works amazingly well! They also like it when I put the mandolin where they can touch it and feel the vibrations.
Basic models of flocking behavior are controlled by three simple rules: 1) separation: avoid crowding neighbours (short range repulsion); 2) alignment: steer towards average heading of neighbors; 3) cohesion: steer towards average position of neighbors (long range attraction). With these three simple rules, the flock moves in an extremely realistic way.
@pauline @sifutweety @zunguzungu Yes, but: https://fstoppers.com/commercial/pictures-unbelievable-macro-shots-taken-inside-instruments-6129