Why Marine Mammals Suck

TL;DR

Marine mammals have had to develop specialized feeding strategies, such as suction feeding and hydraulic jetting, to adapt to their underwater environment.

Transcript

This SciShow video is supported by Brilliant. As a SciShow viewer, you can keep building your STEM skills with 20% off an annual premium subscription at Brilliant.org/SciShow. [♪ INTRO] You might think that the way mammals eat is not complicated. They open their mouths, and they bite the thing that they want to eat. That’s what I do when I see a cu... Read More

Key Insights

• 🤱 Marine mammals have had to adapt their feeding techniques to the underwater environment.
• 😋 Sperm whales are able to suction feed despite their narrow jaws through tongue and cheek movement.
• 💦 Hydraulic jetting, a method of expelling water, is observed in seals and helps prevent swallowing excess water.
• 🤱 Different marine mammal species may have varying preferences for feeding styles.
• 🤱 Marine mammal adaptation includes changes in feeding methods, such as the evolution of baleen for filter-feeding in whales.
• 👻 The flexibility in feeding techniques allows for a more varied diet in marine mammals.
• 🤱 Evolution has had to relearn the process of suction feeding in marine mammals transitioning from a terrestrial to an aquatic lifestyle.

Questions & Answers

Q: What are the different feeding strategies used by marine mammals?

Marine mammals use various techniques, including suction feeding, biting, ramming, and hydraulic jetting.

Q: How do sperm whales manage to suction feed with their narrow jaws?

Sperm whales create negative pressure by dropping their tongues and hollowing out their cheeks, allowing them to slurp prey into their mouths.

Q: Why is expelling water from the mouth important for marine mammals?

Swallowing water along with the food can be costly for marine mammals, so expelling the water through hydraulic jetting helps remove the excess without losing the prey.

Q: What did a study on seals reveal about their feeding styles?

The study found that seals prefer suction feeding and use tongue depression to create suction, even when the food is protruding or deeper within a cylindrical hole.

Summary & Key Takeaways

• Marine mammals have evolved different feeding strategies due to the viscosity of water, with some using suction feeding and others using biting or ramming techniques.

• Sperm whales, despite their narrow jaws, are able to suction feed by dropping their tongues and creating negative pressure in their mouths.

• Jetting, a method of expelling water from the mouth, is observed in seals and is also beneficial for marine mammals to avoid swallowing excess water.