268 How the egg rolls: a morphological analysis of avian egg shape in the context of displacement dynamics.

267 The evolution of egg shape in birds: selection during the incubation period.

266 Urine marking in male domestic dogs: honest or dishonest?

265 Two populations of Anolis lizards that survived Hurricanes Irma and Maria had larger toepads, longer forelimbs and shorter hindlimbs relative to the pre-hurricane populations, which suggests hurricane-induced natural selection.

264 Age and performance at fledging are a cause and consequence of juvenile mortality between life stages.

263 GPS tagging reveals leaders and followers among migrating white storks.

262 High parasite diversity accelerates host adaptation and diversification.

261 Recent Asian origin of chytrid fungi causing global amphibian declines.

260 Thick eggshells of brood parasitic cowbirds protect their eggs and damage host eggs during laying.

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.

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