• This family of dinosaurs (a species called Oryctodromeus cubicularis) lived about 95 million years ago in what is today the U.S. state of Montana. Paleontologists discovered the Oryctodromeus fossil family in 2006.

    Oryctodromeus was a burrowing dinosaur. The Montana burrow reached about half-a-meter (1.6 feet) underground, twisting and turning more than 2.1 meters (6.9 feet) along the way.

  • Term Part of Speech Definition Encyclopedic Entry
    arid Adjective


    bipedalism Noun

    form of movement where an animal consistently uses two legs for standing or walking.

    burrow Noun

    small hole or tunnel used for shelter.

    desert Noun

    area of land that receives no more than 25 centimeters (10 inches) of precipitation a year.

    Encyclopedic Entry: desert
    dinosaur Noun

    very large, extinct reptile chiefly from the Mesozoic Era, 251 million to 65 million years ago.

    environment Noun

    conditions that surround and influence an organism or community.

    family Noun

    group of organisms that come from the same ancestors and share similar characteristics. Family is also a classification in chemistry and math.

    Encyclopedic Entry: family
    food Noun

    material, usually of plant or animal origin, that living organisms use to obtain nutrients.

    Encyclopedic Entry: food
    forelimb Noun

    front limb of an animal, such as an arm, leg, wing, or flipper.

    fossil Noun

    remnant, impression, or trace of an ancient organism.

    Encyclopedic Entry: fossil
    habitat Noun

    environment where an organism lives throughout the year or for shorter periods of time.

    Encyclopedic Entry: habitat
    microclimate Noun

    small area where the climate differs within a larger climate region, such as "heat islands" in a city.

    Oryctodromeus Noun

    species of small, burrowing dinosaur.

    paleontologist Noun

    person who studies fossils and life from early geologic periods.

    polar Adjective

    having to do with the North and/or South Pole.

    predator Noun

    animal that hunts other animals for food.

    terrestrial Adjective

    having to do with the Earth or dry land.

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