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.

239 The Jellyfish Cassiopea Exhibits a Sleep-like State.

238 Lizards on newly created islands independently and rapidly adapt in morphology and diet.

237 Eye patches: Protein assembly of index-gradient squid lenses.

236 Winter storms drive rapid phenotypic, regulatory, and genomic shifts in the green anole lizard.

235 A novel mechanism for mechanosensory-based rheotaxis in larval zebrafish.

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