Manta Rays and Sardine Migration

The video discusses the annual sardine migration along the South African coast, where millions of sardines travel in large groups, attracting various predators like dolphins, sharks, birds, and whales. The video also highlights the presence of giant oceanic manta rays, which are vulnerable to predators due to their lack of defensive mechanisms. Manta rays rely on their speed and flattened bodies for protection, unlike stingrays that have a protective spine.

What natural event marks the beginning of the sardine migration in South Africa?

• The end of spring

• The end of autumn

• The start of winter

• The start of summer

How long can the sardine masses stretch during their migration?

• More than 11 miles

• More than 5 miles

• More than 7 miles

• More than 9 miles

What provides a steady source of food for the migrating sardines?

• Seaweed

• Small fish

• Coral reefs

• Plankton

Which of the following predators are known to target sardines during their migration?

• Lions

• Eagles

• Dolphins

• Crocodiles

What is the wingspan of the giant oceanic manta rays?

• 24 feet

• 22 feet

• 20 feet

• 18 feet

What do manta rays rely on for protection against predators?

• Protective spine

• Speed and flattened bodies

• Venom

• Sharp teeth

What is the top speed that manta rays can reach to escape predators?

• 30 miles an hour

• 25 miles an hour

• 20 miles an hour

• 15 miles an hour

Unlike stingrays, what do manta rays lack?

• A filter feeding system

• A central body

• A large wingspan

• A protective spine

What must a shark do to fatally injure a manta ray?

• Bite its head

• Bite through its central body

• Bite its tail

• Bite its wings

What is the primary diet of manta rays?

• Small fish

• Coral

• Plankton

• Seaweed