Ace the Stickleback Challenge 2026 – Dive into Success!

Natural selection acts on heritable traits that affect fitness, so features that influence survival and reproduction can evolve over generations. The size and shape of skeletons are classic examples of such traits because they directly shape how an organism moves, feeds, escapes predators, and interacts with its environment. These skeletal features are built from genetic information and tend to be less influenced by short-term environmental changes than some other traits, making them reliable targets for selection. Over time, populations can shift toward body plans that optimize locomotion, balance, and resource use in their specific habitats, as seen in sticklebacks where different environments favor different skeletal configurations.

Coat color can also be shaped by selection, especially for camouflage or signaling, and habitat preference can evolve as a behavioral response to environment. However, these traits often involve multiple genes, plasticity, or learned aspects that can complicate direct, rapid evolution in the same way as structural skeletal traits.