Subsurface Locomotion

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    <-NARRATOR:-> Listen to part of a lecture from a biology class.
    <-FEMALE PROFESSOR:-> When we humans walk from place to place, we move on the Earth's surface,
    across the Earth's surface.
    Many animals, of course, do the same thing -
    horses, and dogs, and cows, and so on all move on the surface,
    across the surface of the earth....
    But there are also quite a few animals that have the ability to move from place to place underground,
    beneath the earth's surface.
    This moving around underground is known as subsurface locomotion.
    Subsurface locomotion has a number of benefits.
    One benefit of subsurface locomotion
    is that it enables animals to minimize their exposure to extreme temperatures.
    This is very helpful for animals that live in areas with harsh climates,
    where it could be very dangerous to spend large amounts of time on the surface.
    For example, in the Sahara Desert, in Africa,
    there's a type of lizard that's able to move beneath the surface-
    through the sand-very quickly.
    Because this lizard can move so easily and so quickly underground,
    it doesn't have to travel on the surface,
    where it would be exposed to dangerously high temperatures.
    Another benefit of subsurface locomotion
    is that it can help animals capture prey.
    That's because animals on the surface
    can't see predators that are approaching underground.
    Our lizard in the Sahara Desert is again a good example.
    The way it works is,
    when an insect is walking nearby on the surface,
    it produces very subtle vibrations in the sand.
    When the lizard senses these vibrations,
    it moves very quickly - underground,
    where it can't be seen -
    toward the source of the vibrations.
    It then suddenly pops up right under the insect,
    and catches it completely by surprise.

问题

Using the example of the lizard from the lecture, explain two benefits of subsurface locomotion.

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  • The professor talks about two benefits of subsurface locomotion.

    First, it minimizes the exposure of animals to extreme temperatures, which is very beneficial for animals living in harsh environments. For example, in a desert in Africa, a kind of lizard can move very quickly and easily through the sand, so that they don’t need to walk on the surface and risk the dangerously high temperatures.

    Second, subsurface locomotion also helps animals catch their prey, since if they move beneath the surface, the prey cannot see them. For example, when prey moves on the sand, there are subtle vibrations that lizards can sense. Then they move quietly beneath the sand towards the source, and then pop out suddenly to capture the prey in surprise.

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