SortStack #1247 — 2029-11-07

By speed · Order from slowest to fastest.

1. A chicken foraging 3.6 km/h

   Chickens can recognise over a hundred individual faces, both other birds and the humans who feed them.

2. A scurrying hedgehog 6.4 km/h

   A startled hedgehog rolls into a tight ball, raising up to 6,000 spines that few predators dare to bite.

3. A casual cyclist 12.5 km/h

   The bicycle is one of the most efficient machines ever made, turning muscle into distance better than walking.

4. A record badminton smash 565 km/h

   The shuttlecock is the fastest object in any racket sport, though it decelerates almost as quickly as it launches.

5. A volcanic pyroclastic flow 700 km/h

   A pyroclastic flow is a searing avalanche of gas and ash that buried Pompeii's residents almost instantly.

6. A missile warhead on re-entry 24K km/h

   An intercontinental missile arcs into space before plunging back down, its warhead glowing from the friction.

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