415 Optimization of avian perching manoeuvres.

414 Hot and dry conditions predict shorter nestling telomeres in an endangered songbird: Implications for population persistence.

413 Whiskers as hydrodynamic prey sensors in foraging seals.

412 Vocal babbling in a wild parrot shows life history and endocrine affinities with human infants.

411 A viral mutualist employs posthatch transmission for vertical and horizontal spread among parasitoid wasps.

410 Transport features predict if a molecule is odorous.

409 Bats host the most virulent—but not the most dangerous—zoonotic viruses.

408 AVONET: morphological, ecological and geographical data for all birds.

407 Sodium-enriched floral nectar increases pollinator visitation rate and diversity.

406 Butterfly eyespots evolved via cooption of an ancestral gene-regulatory network that also patterns antennae, legs, and wings.

405 Measuring biodiversity from DNA in the air.

404 Fish waves as emergent collective antipredator behavior.

403 Ants resort to majority concession to reach democratic consensus in the presence of a persistent minority.

402 Application of insects to wounds of self and others by chimpanzees in the wild.

401 Evolution of inner ear neuroanatomy of bats and implications for echolocation.

400 Fear of predators in free-living wildlife reduces population growth over generations.

399 The number of tree species on Earth.

398 A century of ringing records implies that reed warblers use the Earth’s magnetic field as a stop sign to identify their natal breeding sites.

397 Nitrogen recycling via gut symbionts increases in ground squirrels over the hibernation season.

396 Conservation of magnetite biomineralization genes in all domains of life and implications for magnetic sensing.

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