How climate models miss where animals actually move — a math fix that changes extinction predictions

Most climate models assume animals move randomly when searching for habitat, but they actually move toward better conditions. This paper builds a mathematical model that captures directional movement, showing it creates population bottlenecks in certain locations and changes which species survive climate shifts.

For decades, ecologists have modeled species movement as random diffusion — essentially assuming animals wander around equally in all directions. This gets the geography wrong. Real animals move toward cooler spots, better food, or whatever their environment tells them to seek. The model matters because it predicts where species will actually concentrate under climate change, which is where they're most vulnerable to extinction — and where corridors of habitat become critical. If a species gets herded by climate gradients into a few favorable patches, losing even one patch could trigger collapse. The old models wouldn't see that coming.