Pigeon Liver Delivers Navigation
Scientists discover complex connections
between environmental conditions and multi-
organ systems in pigeons that enable navigation
The Liver Delivers for Navigation
The Hidden Wonders of Pigeon Flight
by Dr. Sarah Buckland-Reynolds
For centuries, homing pigeons have astonished observers with their uncanny ability to return home across vast distances. The mystery of their navigation has been probed by countless studies, often framed within evolutionary narratives.
Yet, a recent discovery revealed something profoundly unexpected: the secret to pigeon navigation during certain conditions lies not only in the pigeons’ eyes or brains but are governed by even more complex processes elsewhere in their bodies: in their livers. The findings were published in a research paper in Science, entitled:
Homing pigeon navigation relies on superparamagnetic macrophages under overcast conditions (Clivia Lisowski et al., Science, 28 May 2026).
As the article’s abstract notes, pigeon navigation consists of carefully orchestrated conditions across distinct biological systems within the pigeon’s organism, with the navigation role of the liver being activated under specific environmental conditions. In the words of the article:
“Magnetite particles in the beak, cryptochromes in the eye, cellular ion-channel alterations, and changes in the vestibular system have been proposed to explain magnetoreception, but the exact mechanisms remain debated. Here, we used physical, morphological, functional, and genomic assays to identify the presence of superparamagnetic macrophages in the liver. We found that after macrophage depletion, pigeons flying under overcast conditions lacked their usual orientation capabilities. Orientation was unimpaired in birds without macrophages when the sun was visible, suggesting that this was their primary cue. We propose that in homing pigeons, superparamagnetic macrophages in the liver are required for finding magnetic direction.”
In this article, we reflect on this additional layer of complexity discovered in the process of pigeon navigation, and consider pertinent questions about origins, design, and traditional evolutionary interpretations.
Evolutionary Views on the Liver
Evolutionary biology has long hypothesized that the liver is an ancient organ, arising early in vertebrate development as a metabolic hub. It is said to have evolved gradually from primitive digestive tissues in ancestral chordates, and only after deep time, eventually becoming central to detoxification, metabolism, and iron storage.
In their recent study, Lisowski et al (2026) uncovered that the specific mechanism from the liver that enables such navigation are specialized cells called macrophages. Evolutionary accounts portray macrophages as ancient scavengers: descendants of unicellular amoeboid organisms that simply engulfed particles for survival. Over time, they are said to have diversified into versatile regulators of defense, repair, and homeostasis. Yet, recent research such as Lisowski et al.’s paper highlights that these cells function on a level of integration and complexity far beyond what evolutionary biology typically describes for immune cells like macrophages.
In a commentary on their findings, published by the Max Planck Institute, the scientists revealed their surprise about the intricate versatility of the macrophages that function as immune cells. In the words of Prof. Christian Kurts, co-author and Director at the Institute of Molecular Medicine and Experimental Immunology at the University Hospital Bonn, they admitted:
“We didn’t expect immune cells to act like sensors for magnetic fields at all. Our results reveal a previously unknown mechanism for magnetic perception in animals”.
The mechanism by which these cells function like sensors is through the action of breaking down old red blood cells. As the Max Plank article explains:
“As part of this process, they accumulate iron, giving them quantum properties that may allow them to respond to magnetic fields. Without these cells intact, pigeons could not navigate home, the study shows…. What looks like a ‘gut feeling’ in bird navigation may actually have a physical basis…”
With its assumptions of gradual and simplistic origins, evolutionary theory never predicted that the liver would house a navigation system. The surprise expressed by scientists underscores this. If gradual, piecemeal processes were sufficient, why did no one anticipate such a sophisticated integration of immunity, iron metabolism, and geomagnetic sensing?
More on the Discovery: Superparamagnetic Macrophages
The iron accumulation in the pigeons’ livers due to the breakdown of red blood cells was described as producing tiny iron crystals. The arrangement of these crystals is not random but actually gives the cells superparamagnetic properties. This means that they can respond very sensitively to external magnetic fields or other geomagnetic forces. When the field is removed, the cells do not retain magnetism, making them ideal biological sensors.
Unlike the magnetic particles found in bacteria, fish, or even mammals that are usually confined to sensory tissues like the nose or brain, the researchers found that the iron-positive macrophages in pigeons’ livers suggest a broader, integrated navigation system, as they respond to specific environmental cues. What makes pigeons’ livers even more remarkable is that these cells that contribute to navigation play a dual function in the immune system to help the body coordinate a defense response, in addition to their navigation role. The type of macrophage that pigeons use in navigation is called MHC II+ (Major Histocompatibility Complex class II), which plays an active communication role in immunity. While the immune function of these MHC II+ macrophages is present in other animals and even humans, they are not known to perform the dual function of navigation in other contexts. Therefore, based on this discovery, pigeons appear to possess a unique combination of immune communication with magnetic sensing.
Superior Engineering: Physics Meets Biology
To fully appreciate the implications of Lisowksi et al.’s findings, it is useful to explore the engineering principles inherent in the design that enables these functions discovered in pigeons. The functionalities rely on both external and internal physical and biological principles to properly function. As the authors explain, pigeons exploit fundamental physics to enable navigation.
“Ferritin-bound unpaired electrons interact through magnetic dipole-dipole coupling, enabling uniform alignment along Earth’s declination lines” (Lisowski et al., 2026).
In simpler terms, the process behaves similarly to how a compass works. A compass needle is a magnet that lines up with Earth’s magnetic field. However, in pigeons, the iron stored in ferritin proteins has unpaired electrons that act like numerous tiny compass needles. These electrons influence each other through magnetic dipole coupling, where instead of pointing in random directions, they align together. That collective alignment lets the cells orient along the invisible pathways of the Earth’s magnetic field. This arrangement is even superior to manmade compass designs, as unlike the rigidity of a manmade compass, which is also single-purpose, this biological system is flexible and integrated into the body, making it a more dynamic way to sense Earth’s magnetic field.
These principles also operate within a complex system that remains interdependent on precise conditions for its activation. Without directly acknowledging irreducible complexity, the researchers themselves acknowledged the intricacy stating that:
Homing pigeon (Wikipedia)
“…hepatic macrophages sense changes in Earth’s magnetic field and transmit this information to the brain via afferent vagal innervation. We posit that magnetic sensing requires a cell population–level signal, rather than single-cell detection, to reach the threshold for neuronal activation. Liver macrophages are well equipped for this role, as they accumulate ferric iron during erythrocyte clearance and are closely associated with autonomous nerves. Such nerves, for example, the vagus or sympathetic nerves, generally provide rapid, bidirectional communication between peripheral organs and the brain and are ideally positioned to relay magnetic information sensed in the liver” (Lisowski et al., 2026).
Breaking this description down further, there are numerous steps described for these processes to function, including:
- Iron metabolism to load macrophages with ferritin.
- Superparamagnetic alignment of electrons.
- Proximity to nerve fibres for signal transmission.
- Integration in the brain’s pallial regions.
For pigeon flights to function, each step must be present simultaneously. A half-formed system would confer no survival advantage. Evolutionary gradualism therefore cannot explain how such a multi-layered mechanism arose piecemeal.
The experimental findings themselves confirmed how the response systems failed to function when certain conditions were not met. To test the role of the macrophages, the researchers used clodronate to deplete the macrophages in a subset of the pigeons. When these macrophages were depleted using clodronate liposomes, pigeons lost their ability to navigate under overcast skies. In their words;
‘Thirty-four pigeons were trained individually to home over a 19-km route from west to east. After 10 successful training flights, birds were randomized to receive either intravenous clodronate liposomes (n = 18) or control liposomes (n = 16) … when the weather forecast predicted completely overcast conditions for the next day. Twenty-four to 28 hours later, pigeons were released individually under completely overcast conditions and tracked using real-time Internet of Things GPS devices…. All control-treated pigeons homed within 70 min, whereas none of the clodronate-treated birds returned on the same day under persistent overcast conditions, instead displaying random spatial orientation…. Importantly, macrophage-depleted pigeons homed normally once cloud cover cleared, and the sun became visible, indicating intact flight capacity, motivation, and overall health. When we retreated control pigeons with clodronate, they successfully homed under sunny conditions (i.e., when directional solar information is available), with high track efficiency, similar to their prior performance…. Together, these findings indicated that pigeons can sense magnetic direction independent of a purported visual (cryptochrome-mediated) magnetic sensing system and that macrophages are required for finding magnetic direction under conditions in which solar and landmark cues are unavailable.’
The results of the experimentation show dual reliance with conditional activation of different sections of a pigeon’s biological system to external cues. This follows the engineering principles of redundancy and fail-safe systems (having multiple parts of the system with similar functions that can chip in when one does not function). How could evolution produce such engineering?
Joining the List of Nature’s Navigators
Interestingly, the discovery of these engineering principles in pigeons adds to the growing list of other organisms that operate in similar ways. The study itself notes various parallels in nature:
“Sharks can detect variations in the geomagnetic field… scalloped hammerhead sharks swim in straight lines over long distances, orienting toward seamounts associated with geomagnetic anomalies” (Lisowski et al., 2026).
Even beyond the examples cited in the study, nature has shown similar traits even at the microscopic level. For example, magnetotactic bacteria, which use magnetosomes to align with geomagnetic fields. These organisms also build tiny structures called magnetosomes (chains of magnetic crystals inside their cells) which let them align with Earth’s geomagnetic field much like a compass needle. This alignment helps them swim in straight lines through water, often guiding them toward oxygen levels that suit their survival. From the smallest to the largest creatures, whales also follow geomagnetic cues across oceans. Bats and blind mole rats navigate without light, suggesting similar mechanisms.
The Wisdom of the Liver Compass
While the researchers expressed surprise about not expecting immune cells to act like sensors for magnetic fields, they hinted in the Max Planck publication that there were some known mechanisms in the liver and spleen that would make them candidates for having magnetic properties due to their breakdown of red blood cells and iron storage capabilities. Given this function of processing iron, the liver is an efficient organ to leverage existing pathways to house magnetic sensors. Furthermore, the macrophages’ proximity to nerve fibres allows rapid communication with the brain.
This wisdom of placement reflects foresight. As the authors themselves conclude:
“Tissue-resident macrophages can function as peripheral sensory cells, providing direct, biologically meaningful feedback to the brain” (Lisowski et al., 2026).
How could such a hidden function be made so efficient if it arose from blind, unguided processes?
The Liver Delivers: A Biblical Reflection
Lisowski et al.’s publication presents yet another example of wisdom in observations that oftentimes seem mundane, like a pigeon’s flight. Increasingly, science is uncovering unseen processes that operate more efficiently than manmade devices, in creatures and organs that are often theorized to be ‘simple’ by evolutionists. The lowly liver compass in pigeons is just one more example of an organism pointing us to the Creator’s wisdom.
Scripture reminds us: “The heavens declare the glory of God; the skies proclaim the work of his hands” (Psalm 19:1). As we can expect to see even more remarkable discoveries from further research declaring God’s glory in creation, let us be reminded of his wisdom and care, even when observing the otherwise seemingly ‘mundane’ patterns of pigeons’ flight.
Dr. Sarah Buckland-Reynolds is a Christian, Jamaican, Environmental Science researcher, and journal associate editor. She holds the degree of Doctor of Philosophy in Geography from the University of the West Indies (UWI), Mona with high commendation, and a postgraduate specialization in Geomatics at the Universidad del Valle, Cali, Colombia. The quality of her research activity in Environmental Science has been recognized by various awards including the 2024 Editor’s Award from the American Meteorological Society for her reviewing service in the Weather, Climate and Society Journal, the 2023 L’Oreal/UNESCO Women in Science Caribbean Award, the 2023 ICETEX International Experts Exchange Award for study in Colombia. and with her PhD research in drought management also being shortlisted in the top 10 globally for the 2023 Allianz Climate Risk Award by Munich Re Insurance, Germany. Motivated by her faith in God and zeal to positively influence society, Dr. Buckland-Reynolds is also the founder and Principal Director of Chosen to G.L.O.W. Ministries, a Jamaican charitable organization which seeks to amplify the Christian voice in the public sphere and equip more youths to know how to defend their faith.