Why Aren't There Giant Insects

The video explores why insects today are smaller than their prehistoric counterparts. It discusses theories such as the exoskeleton's weight and oxygen delivery systems as limiting factors for insect size. Dr. John Harrison provides insights, suggesting that higher oxygen levels in the past allowed for larger insects. The video concludes that while definitive answers are lacking, oxygen levels likely played a significant role.

What is the largest insect on record mentioned in the video?

• Giant Wetta of New Zealand

• Atlas Moth

• Mega Nura Dragonfly

• Goliath Beetle

Why is the exoskeleton theory considered a non-starter according to Dr. Harrison?

• Exoskeletons are only found in small insects

• Exoskeletons are too heavy for large insects

• Exoskeletons dissolve in water

• The proportion of exoskeleton to body size is consistent

How do insects breathe differently from humans?

• Through gills like fish

• Through lungs like mammals

• Through a series of holes and air-filled tubes

• Through their skin

What was the atmospheric oxygen level during the late Paleozoic era?

• 21%

• 32%

• 15%

• 25%

What is one reason suggested for the larger size of insects in the past?

• Higher levels of atmospheric oxygen

• Stronger exoskeletons

• Lack of predators

• More abundant food sources