Being a sentry is a risky business as they are easy targets for predators.
But with young pups to protect they take even greater risks by climbing higher.
Here they can see predators sooner - but they're vulnerable to birds of prey.
Their self-sacrifice is about to be tested.
But this is no ordinary cobra, it's a Spy Cobra.
With no regard for her own safety she prepares to face the snake.
She reacts as she would to the real thing - bravely protecting the colony and their precious cubs with no thought for herself.
Her aim is to harass the snake into leaving.
But with Spy Snake holding its ground, the meerkat calls for reinforcements.