Fox

Foxes are familiar animals that most people have seen or heard. Their reputation as clever tricksters is well-earned in ways that go beyond folklore — foxes use the Earth's magnetic field as a targeting system, can hear prey moving underground, and have adapted to urban environments so successfully that city fox populations are now studied as a model for rapid behavioral evolution.

Facts you didn't know

• 1

  Foxes use the Earth's magnetic field to aim when pouncing on prey under snow. They align their approach toward magnetic north before launching their pounce — and studies show they're significantly more successful when pouncing in a north-northeast direction than in any other direction.

• 2

  A fox can hear a mouse moving underground under a meter of snow. Their large, independently rotating ears triangulate the precise location of sounds below the surface before they commit to a pounce.

• 3

  Urban foxes have adapted so rapidly to city environments that they've measurably shorter snouts, smaller brains, and more varied behavior than their rural counterparts — observable evolution over just decades of urban living.

• 4

  Foxes cache food by burying it in numerous small scattered locations, remembering each site using landmarks. They also actively check competitor foxes' caches and move their own food after being watched, suggesting they understand that others can steal from them.

• 5

  Fox cubs play-fight using a behavior called 'mouthing' — biting each other's ears and necks without causing injury — to establish the dominance hierarchy they'll need for accessing food and eventually mates. The play looks rough but is carefully calibrated.