Red Crabs of Christmas Island

The video explores the life of red crabs on Christmas Island, focusing on their migration during the monsoon season. It highlights the challenges they face, such as suffocation due to dry air and predation by robber crabs. Despite these threats, the red crab population remains robust, with over 45 million crabs migrating across the island.

What do the red crabs of Christmas Island primarily feed on?

• Rotting leaves

• Small fish

• Fresh leaves

• Insects

What triggers the red crabs to start their march?

• Rising humidity and the monsoon

• Mating season

• Decreasing temperatures

• Availability of food

What is a significant environmental challenge the crabs face during their journey?

• Suffocation due to dry air

• Lack of food

• Predators

• Flooding

How do land crabs breathe?

• With gills that must remain moist

• With spiracles

• Through their skin

• Through lungs

What happens when the clouds part during the crabs' journey?

• They stop marching

• They find more food

• Water evaporates making it hard to breathe

• It becomes easier for them to breathe

What is the leg span of the robber crabs that prey on the red crabs?

• Up to half a meter

• Up to three meters

• Up to two meters

• Up to one meter

Why have robber crabs become the top predator on Christmas Island?

• They have little competition

• They are faster than other predators

• They are immune to the monsoon

• They can fly

Approximately how many red crabs are there on Christmas Island?

• Over 45 million

• 20 million

• 10 million

• 30 million