The video explores how parasitic worms invade amber snails, turning them into 'zombie' snails. These worms manipulate the snails to expose themselves to birds, which eat the snails and spread the parasites. The cycle continues as birds excrete the parasite eggs, which are then consumed by snails. Interestingly, infected snails may live longer, and their behavior is altered to benefit the parasites.

What happens to the amber snail when it is invaded by parasitic worms?

• It becomes a pulsating snail zombie.

• It becomes invisible.

• It starts glowing in the dark.

• It turns into a butterfly.

How do the parasitic worms complete their life cycle?

• By moving from snails to fish.

• By living in the soil.

• By traveling from snails to birds and back.

• By staying inside the snail forever.

What do the parasitic larvae do to the snail's eye stalks?

• They make them glow.

• They turn them into flowers.

• They make them disappear.

• They make them resemble pulsating caterpillars.

How do birds contribute to the life cycle of the parasitic worms?

• By eating the snails.

• By destroying the worms.

• By ingesting the worms and later excreting their eggs.

• By carrying the worms to other snails.

What unusual behavior do infected snails exhibit?

• They hide underground.

• They swim in water.

• They crawl into plain view of birds.

• They fly.

What is the purpose of the worms controlling the snails' behavior?

• To make them invisible.

• To help them find food.

• To help them swim.

• To make them more visible to birds.

What is the irony mentioned about infected snails?

• They become immune to all diseases.

• They turn into birds.

• They live longer than uninfected snails.

• They can fly.