troglodytes

"The peasants put two scorpions in a large bottle, and then take wagers as to which will win the struggle. Slowly the scorpions circle each other, until one lashes out at the other, and strikes him dead."

"The old book described early humans as troglodytes, living in caves and hunting with stone tools. "

"The new technology in our school's library allows students to access millions of books online. "

"My brother uses the underground to get to work every day. "

"My sister is very helpful, especially when it comes to organizing things. "

"an ancient city  an ancient forest"

"The reactionary at the school board meeting argued against the new curriculum, preferring the old methods. "

"The library offered an extension on the due date for the overdue books. "

"The city was rapidly populated after the discovery of gold. "

"My grandfather helped me with my math homework. "

"While hiking in the damp forest, we found several brightly colored salamanders hiding under a log. "

"After winning the lottery, he became reclusive, rarely leaving his house or speaking to anyone. "