The Military UAP Case Identified as Birds

Introduction

AARO’s PR-016 case is a unusually clear example of how ordinary birds can become unidentified “orbs” or compact blobs in military infrared footage. The 25-second video was recorded by an infrared sensor aboard a US military platform in Europe in 2023 and submitted by United States European Command to the All-domain Anomaly Resolution Office (AARO). AARO ultimately assessed, with greater than 95 per cent likelihood, that the objects were birds.[AARO]aaro.milUAP ImageryAARO UAP Imagery…

The important part is not simply that investigators decided the objects “looked like birds”. AARO cited several mutually reinforcing clues: their morphology resembled birds in previously resolved imagery; the objects maintained relative positions in a way consistent with energy-saving formation flight; and their infrared returns pulsated at a frequency consistent with wing beats.[DVIDS]dvidshub.netVideo - PR-016, Resolved as Birds, Europe 2023…

That last clue is especially revealing. Even when distance and sensor resolution erase recognisable wings from individual frames, flapping can leave a repeating signature through time. In other words, the bird’s anatomy may disappear while its behaviour remains detectable.

What the military infrared footage showed

The case is officially designated PR-016, Resolved as Birds, Europe 2023. According to AARO and the US Defense Visual Information Distribution Service (DVIDS), the source material consists of 25 seconds of infrared footage from a US military platform. AARO publicly released the case imagery in December 2025.[DVIDS]dvidshub.netVideo - PR-016, Resolved as Birds, Europe 2023…

View AARO’s PR-016 case imagery and assessment[aaro.mil]aaro.milUAP ImageryAARO UAP Imagery…

AARO did not identify a publicly specified bird species. Nor does its short public case description provide the sensor model, target range, reconstructed size or a frame-by-frame technical analysis. The published conclusion is therefore narrower than a species-level identification: the office judged the collection of objects to be almost certainly birds on the basis of their appearance and behaviour.[AARO]aaro.milUAP ImageryAARO UAP Imagery…

That distinction matters. At long range, an infrared system does not necessarily preserve the familiar visual features people associate with birds. Infrared bird-tracking research treats flying birds as targets whose apparent shape and scale can vary substantially, while thermal detection research has long demonstrated that animals can remain detectable as infrared targets even where image detail is limited. Birds can therefore register clearly enough to track without supplying a textbook silhouette in every frame.[arXiv]arxiv.orgarXiv A Comparative Study of Object Trackers for Infrared Flying Bird TrackingA Comparative Study of Object Trackers for Infrared Flying Bird TrackingJanuary 18, 2016…Published: January 18, 2016

PR-016 is useful precisely because AARO did not depend on seeing a crisp beak, tail and pair of wings. Instead, investigators effectively treated the footage as a time series of moving infrared objects. Once their collective movement and repeating changes in infrared appearance were considered, information that was ambiguous in individual frames became diagnostic.

Why formation flight mattered

One of AARO’s stated reasons for identifying PR-016 as birds was that the objects maintained their relative positions in a manner associated with energy conservation during flight.[AARO]aaro.milUAP ImageryAARO UAP Imagery…

That observation has a strong basis in avian flight research. Formation flight is particularly associated with larger birds travelling together. Birds positioned appropriately relative to neighbours can exploit aerodynamic upwash generated by other birds’ wings. Experimental research on great white pelicans found significant energy savings in formation flight, including longer periods of gliding, while theoretical work on V formations has likewise investigated the energetic advantage created by suitable spacing.[Nature]nature.comEnergy saving in flight formation | NatureEnergy saving in flight formation | NatureOctober 18, 2001…Published: October 18, 2001

The relevant clue in PR-016 was therefore not merely that several dots happened to travel in the same direction. A flock provides a pattern above the level of the individual target: multiple objects remain organised relative to one another while progressing together. That collective geometry can survive degradation that makes each member individually difficult to recognise.

This is an important distinction for interpreting apparent UAP formations. Several similar compact objects moving together can initially seem more unusual than one unidentified object. Yet for a bird hypothesis, multiplicity can actually add identifying information. A single unresolved infrared point offers little behavioural context; a group preserving bird-like spacing and common movement supplies a second line of evidence.

AARO’s wording should nevertheless be kept precise. Its public PR-016 description specifically mentions relative positioning for energy conservation; it does not publish enough information to reconstruct the flock’s aerodynamics or calculate how much energy the animals were saving. The scientifically defensible point is simply that organised formation flight is established bird behaviour and that AARO judged the observed positioning consistent with it.[DVIDS]dvidshub.netVideo - PR-016, Resolved as Birds, Europe 2023…

The wing-beat clue hidden in the infrared signal

The most distinctive evidence in PR-016 is AARO’s report of a “pulsating infrared return at a frequency consistent with wing beats”.[AARO]aaro.milUAP ImageryAARO UAP Imagery…

This means identification did not require investigators to resolve two wings as clearly shaped appendages. A flapping bird continually changes the geometry presented to a camera: the projected area and orientation of its wings vary through each stroke, and different surfaces move into and out of the sensor’s view. In thermal imagery, the temperature distribution across a flying bird is also not uniform. Infrared-thermography experiments show that flight produces substantial heat transfer and that exposed wing surfaces participate in heat dissipation.[Bangor University]research.bangor.ac.ukBangor University How birds dissipate heat before, during and after flightBangor UniversityHow birds dissipate heat before, during and after flight - Bangor UniversityDecember 13, 2023…Published: December 13, 2023

At sufficient resolution, those processes can be seen as changing anatomy. At poorer resolution, the fine structure can collapse into something simpler: a compact target whose total infrared appearance becomes brighter, dimmer, larger or smaller in a repeating rhythm. The shape information has been degraded, but temporal information survives.

That makes periodicity unusually valuable. Sensor noise, compression artefacts and atmospheric effects can all make a small target fluctuate, so variation by itself proves little. A repeated signal occurring at a biologically plausible wing-beat frequency, however, is more specific — particularly when the same targets simultaneously display flock-like organisation and bird-like morphology.

AARO’s reasoning becomes clearer when compared with another of its investigations. In its detailed analysis of the 2013 Puerto Rico UAP footage, the office considered and rejected birds as a likely explanation. One reason was that, at the reconstructed distances, AARO expected birds either to retain identifiable features such as wings or to pulsate at the frequency of wing beats.[AARO]aaro.milPuerto Rico UAP Case ResolutionPuerto Rico UAP Case Resolution

That comparison is valuable because it shows that “birds” is not being applied simply whenever an infrared object lacks detail. The wing-beat signature functions as a testable prediction. In PR-016 AARO reported seeing the expected pulsation; in the Puerto Rico analysis, the absence of expected avian features or pulsation counted against the bird hypothesis.[DVIDS]dvidshub.netVideo - PR-016, Resolved as Birds, Europe 2023…

Why several weak-looking clues became a strong identification

No single publicly described feature of PR-016 needs to be decisive on its own. Its strength comes from convergence.

The objects looked morphologically similar to birds in imagery AARO had already resolved. They moved as a coordinated group and maintained relative positioning consistent with bird formation flight. Their infrared signatures then varied periodically at a rate AARO considered consistent with flapping wings. Those are partly independent expectations generated by the same mundane hypothesis.[AARO]aaro.milUAP ImageryAARO UAP Imagery…

That is why the case is more instructive than simply comparing silhouettes:

The combination explains how investigators can reach a strong mundane identification without recovering a detailed visual portrait of the object. AARO’s confidence level — greater than 95 per cent likelihood — reflects an assessment of the combined evidence, not the proposition that every isolated frame unmistakably depicts a bird.[AARO]aaro.milUAP ImageryAARO UAP Imagery…

There is also a useful methodological limit here. A pulsating infrared dot is not automatically a bird, just as a group of dots is not automatically a flock. The evidential value comes from testing whether several characteristics expected under the bird explanation occur together. If the pulsation had an incompatible frequency, the objects repeatedly violated plausible flock behaviour, or other measurements implied impossible bird speeds or sizes, the assessment would need to change.

The case’s lesson for apparent infrared “orbs”

PR-016 illustrates a broader but tightly defined point about military UAP imagery: recognition can survive after recognisable shape has been lost.

An observer looking only for visible wings might conclude that a compact infrared object cannot be a bird. AARO’s analysis demonstrates a different approach. Instead of asking only “What shape is this object?”, investigators can ask how several objects move relative to one another and whether their infrared intensity changes periodically in a way expected from flapping flight.

That distinction is particularly important because infrared sensing can preserve detection while sacrificing identification detail. Research on infrared surveillance explicitly treats birds as challenging airborne targets and as potential sources of confusion in systems designed to detect other small flying objects. Studies comparing thermal detection of drones and birds, for example, note that long-wave infrared sensing can generate false positives from birds and other heat sources, reinforcing the need to use motion and other discriminating features rather than simple target brightness alone.[arXiv]arxiv.orgOpen source on arxiv.org.

PR-016 therefore supplies a concrete military example of a bird becoming something visually much less obvious on a sensor while still carrying avian clues. The decisive evidence was not a perfectly resolved wing. It was the combination of formation, relative motion and rhythmic infrared pulsation. A distant animal could look like an anonymous compact object in space, yet every few wing beats effectively reveal what the missing silhouette could not.

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References

• View AARO’s PR-016 case imagery and assessment

Endnotes

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Additional References

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