Australia's largest gliding marsupial is good. The smaller one is better.
New ANU work tests the greater glider in the wind tunnel it was never designed for, and a Bielefeld-led team finds plants can rewire their light-harvesting in minutes. Two studies that put received wisdom to the test.
Australia's largest gliding marsupial may not be the country's best glider after all. Researchers at the Australian National University have run the greater glider through a series of wind-tunnel and field tests, and the verdict is blunt: bigger has been carrying a reputation it has not earned.
The result lands on 15 July 2026 as a quiet rebuke to decades of textbook folklore. It also sits alongside a separate finding, published this week, that plants rewire their light-harvesting machinery within minutes of being blasted by intense sun. Two studies, two species, one common thread: long-standing assumptions about how living systems actually perform, when someone finally bothers to measure them properly.
A bigger animal, a worse glide
The greater glider (Petauroides volans) is a cat-sized possum that lives in the eucalypt canopy of eastern Australia. It can stretch a membrane between elbow and ankle and slip between trees, and for years naturalists assumed that the largest gliding mammal on the continent was also the most accomplished in the air. The ANU team, led by researcher Alice Herbert-Riveros, set out to test that claim by putting animals and a life-size model in a low-speed wind tunnel and tracking how each handled simulated crosswinds and stalls.
Their data told a less flattering story. The bigger gliders generated more lift in still air, as expected, but they paid for it in manoeuvrability: longer braking distances, poorer recovery from disturbed flow, and a tendency to wallow when the wind shifted. Smaller gliders, by contrast, snapped out of trouble faster and held a tighter line. The implication, in the researchers' phrasing, is that body mass scales against agility in this lineage, and the species most often photographed in textbooks is gliding on reputation rather than aerodynamics.
The finding matters because the greater glider is also one of the more vulnerable arboreal marsupials in eastern Australia, listed as vulnerable nationally and as critically endangered in parts of its range. Habitat fragmentation forces the animals to cross wider gaps between tree clusters as logging and bushfire reshape the canopy. A glider that can recover from a crosswind mid-flight is not a curiosity; it is a survival margin. The team is now working with state agencies in New South Wales and Victoria to fold the new aerodynamic data into retention prescriptions for logged forests, which currently use tree-height and gap-width rules calibrated to a glide performance the species may never have had.
Light, in real time
The second paper, a collaboration between Bielefeld University and ANU, addresses a question that has bothered plant physiologists for a generation: how do leaves cope when the sun comes out hard and fast after a cloudy spell, before the slow hormonal responses that take hours to kick in can do their work. The answer, published in the week of 14 July 2026, is that chloroplasts are doing their own fast-lane engineering.
The researchers tracked a signalling molecule called hydrogen peroxide as it pulsed through leaf tissue in the seconds after a sudden jump in light intensity. The pulse did not just warn the cell of damage; it carried instructions. Within minutes, photosystem II, the part of the photosynthetic engine most easily fried by excess light, was being reorganised at the level of its protein subunits. Some were tagged for repair, others throttled back, others rerouted to dissipate the surplus energy as heat rather than risk producing the reactive oxygen species that bleach chlorophyll. The whole reorganisation was over before most published models of plant acclimation would have predicted the first response.
This is not academic housekeeping. Crops lose an estimated 10 to 30 per cent of their potential yield to photodamage during the kind of rapid light transitions that come with broken cloud cover, intercropping systems, and the dappled canopies of agroforestry. A signalling pathway that completes its work in minutes rather than hours opens the door, at least in principle, to breeding or even spraying for faster acclimation. The same group is now screening Australian wheat cultivars for variants of the peroxide-signalling cascade that respond faster than the commercial standard.
What the assumption was actually buying
It is worth asking why the older view of the greater glider held for so long. The answer is partly an artefact of observation: a larger animal is easier to spot at night with a headtorch, easier to photograph, easier to point at when explaining what gliding mammals are. Over decades, the species that show up most in field guides and wildlife documentaries become the implicit benchmark, and the bench gets normalised. The smaller gliders, several petaurid species whose ranges overlap the greater glider's, have been quietly outperforming them in canopy studies for years, but their data sat in regional journals and conference posters. The ANU wind tunnel just turned the gap into a single comparable number.
The plant finding follows a similar arc. The textbook model of photosynthetic acclimation is built around hormone-driven gene expression measured over hours. It is correct, but it is not the whole story, and the long shadow of the slow model has tended to crowd out the search for faster mechanisms. Now that faster mechanisms have been found, expect a sprint to figure out which species use them most aggressively, and whether the answer lines up with where those species actually live.
What to watch next
Two practical tracks will tell whether this week's results stick. On the glider side, retention rules in NSW state forests are due for a scheduled review in 2027; the ANU aerodynamic data will be a formal submission. If the rules move, it will be the first time Australian forestry prescriptions have been rewritten on the basis of wind-tunnel glide data rather than the height-of-tree heuristic. On the plant side, Bielefeld and ANU are coordinating with the Grains Research and Development Corporation on a cultivar screen scheduled to report preliminary results in early 2027. If any commercial wheat line shows the fast peroxide pulse under field conditions, the agronomic implications reach well beyond Australia.
What remains genuinely uncertain is whether the greater glider's poorer performance translates into measurable mortality in the wild. The wind-tunnel data show what the animal can and cannot do in controlled air; the canopy is messier, with gusts, wet leaves, and predators. The researchers are explicit that the next step is a tagged-animal field study across logged and unlogged forest in the same river catchments, which will run for at least two field seasons before any mortality claim can be defended.
What these two papers share is the unromantic premise that long-cherished claims about living things deserve a measurement every now and then. Sometimes the measurement confirms the claim. This week, in both cases, it did not.
This publication writes on science as a beat that resists consensus-by-repetition. Where field guides and textbook models have settled on a comfortable answer, the test is whether the data still agrees.