259 Rapid evolution of a voltage-gated sodium channel gene in a lineage of electric fish leads to a persistent sodium current.

258 Structure and Distribution of an Unrecognized Interstitium in Human Tissues.

257 Bats without borders: Predators learn novel prey cues from other predatory species.

256 A global study of all bird species in mountainous areas shows that richness decreases predictably with elevation, whereas diversification rates increase.

255 Variation in winter coat color may protect species with winter camouflage—such as hares, weasels, and foxes—when the climate warms.

254 Controlled iris radiance in a diurnal fish looking at prey.

253 Wild Australian magpies (Cracticus tibicen dorsalis) living in large groups show increased cognitive performance, which is associated with increased reproductive success.

252 Alarm calls evoke a visual search image of a predator in birds.

251 Morphology, muscle capacity, skill, and maneuvering ability in hummingbirds.

250 Polar bears’ high-energy lifestyle makes then reliant on sea ice–associated prey.

249 Structural absorption by barbule microstructures of super black bird of paradise feathers.

248 Genomic Analysis of Demographic History and Ecological Niche Modeling in the Endangered Sumatran Rhinoceros Dicerorhinus sumatrensis.

247 The image-forming mirror in the eye of the scallop.

246 Natural selection shaped the rise and fall of passenger pigeon genomic diversity.

245 Disorder in convergent floral nanostructures enhances signalling to bees.

244 Profound reversible seasonal changes of individual skull size in a mammal.

243 Shaping highly regular glass architectures: A lesson from nature.

242 Single rat muscle Na+ channel mutation confers batrachotoxin autoresistance found in poison-dart frog Phyllobates terribilis.

241 Asymmetry hidden in birds’ tracks reveals wind, heading, and orientation ability over the ocean.

240 Poison frogs have evolved mutations in nicotinic acetylcholine receptor genes that confer toxin resistance.

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