Biology
Predator-prey dynamics and vigilance in Thomson's gazelles
Quick fact
Thomson's gazelles spend up to half their time being vigilant when alone, but in large groups, individual vigilance can drop dramatically—some individuals even 'cheat' by relying on others to spot danger.
Why this is interesting
Imagine a gazelle grazing on the open savanna, but it can't just eat in peace—every bite could be its last. How does it decide when to look up?