by Thomas Fernandes
In Part I, we explored how bees navigate without depth perception, using optic flows to fly straight through tunnels, land smoothly, and estimate distance traveled. The visual system we examined works beautifully in providing simple navigation tools to solve complex tasks, leaving brain power for other activities such as pattern identification, nectar extraction, remembering profitable routes, and returning home
But what happens when that same motion-based perceptual interface must track and intercept a moving, evasive target? What are the rules of the hunt in insects? If any species can help us with this question, it is likely the dragonfly, with a hunting success rate close to 95%.
In a chase, a mammalian predator would run an interception course using depth perception to estimate closing distance, not follow in the exact footsteps of its prey. But insects cannot perceive depth and face a major optical challenge in motion parallax. When an observer moves, it becomes difficult to distinguish the target’s actual movement from the apparent motion caused by the observer’s own displacement.
Most flying insects, say flies pursuing other flies, use what’s called parallel navigation. The strategy is simple, you align with your target and match any changes in the target’s direction. If the target veers left, you veer left. This is a reactive pursuit, a continuous adjustment in response to prey movement.
It solves the motion parallax problem efficiently; the hunter only needs to keep the image motion of its prey at zero at all time which ultimately lets it zero in on the target. Notably, these chasing reflexes are driven by specialized “chasing neurons” that respond selectively to small, rapidly moving targets and are found only in chasing insects.
Dragonflies do something fundamentally different, as revealed by tracking studies. Read more »









SUGHRA RAZA. Shadows On The Riverbed. Celestun, Mexico, March 2025.
Allopathy and homeopathy are two contrasting theories of medicine. Allo, meaning other, and homo, meaning same, indicate how suffering (pathos) is cured in these two approaches. Modern medicine, speaking generally, is based on the principle of allopathy, meaning that sickness is counteracted by healing and therapeutic treatments; homeopathy, often considered alternative medicine or pseudoscience, is based on the idea that “like cures like,” so rather than introducing an antidote to an illness, the medicine used is meant to produce a response similar to the illness itself, stimulating the body’s natural healing mechanisms and curing the underlying ailment.

Political discussions and debates leave me cold. That’s because I abhor conflict, and politics always seem to be accompanied by disagreements, fights, raised voices, and anger. When I think about the hot topics in the 60s and 70s, many of them centered on matters of race, I associate those times with images of red-faced individuals confronting one another, not infrequently accompanied by fists, even guns. Sometimes soldiers or militias or mobs.
KK: One of my best friends from high school, Brian Boland, was a regular on the main stage at Second City, which helped define improvisational comedy and produced so many famous comic actors. He’s also an accomplished voice actor and has been in some ads our readers have probably seen (like for Geico). He brought two of his colleagues and they each took on characters in the story, “The Ad Man After Dark.” It was amazing to witness how they brought the characters to life and entertained the audience. 

Do birds have a sense of beauty? Do they, or does any animal, have an aesthetic sense? Do they respond to beauty in ways we might find familiar – with a feeling of awe, suffused with attraction, mixed with joy? Do they seek it out, and perhaps even work to fashion it from their surroundings? Darwin thought so, and made the idea the subject of his second major work, The Descent of Man (1871). In it, he outlined a mechanism by which the sense of beauty might, by shaping mating preferences, work to shape the form of insects, fish, and birds in a manner parallel to the better known process of natural selection. The resulting beauty of form, sound, or movement, Darwin argued, is neither the result of intelligent design, nor a necessary indication of superior fitness. Beauty, as