What's as small as a mouse but guards a house like a lion?

Answer: lock

More Difficult Riddles with answers

More Difficult Riddles

What's the most romantic part about the ocean?
When can someone truthfully tell someone “well done” but think they did a bad job?
When does Christmas come before Thanksgiving?
When I asked her how old she was, she smiled and said cryptically: "The day before yesterday I was 22, but next year I'll be 25." What is her birthday and when was the date of our conversation?
When I get closer my tail grows longer, but when I go away my tail leads the way.
When I live I cry, If you don't kill me I'll die.
When I'm born I fly. When I'm alive I lay. When I'm dead I run.
When I'm used, I'm useless, once offered, soon rejected. In desperation oft expressed, the intended not protected. What am I?
When it comes in, From sea to shore, Twenty paces you'll see, No less, no more.
When it is alive we sing, when it is dead we clap our hands. What is it?
When John was six years old he hammered a nail into his favorite tree to mark his height. Ten years later at age sixteen, John returned to see how much higher the nail was. If the tree grew by five centimeters each year, how much higher would the nail be?
When the celebrated German mathematician Karl Friedrich Gauss (1777-1855) was nine he was asked to add all the integers from 1 through 100. He quickly added 1 to 100, 2 to 99, and so on for 50 pairs of numbers each adding to 101. Answer: 50 X 101=5,050. What is the sum of all the digits in integers from 1 through 1,000,000,000? (That's all the digits in all the numbers, not all the numbers themselves.)