The number of lions is strictly controlled so they don't __________ the ecosystem.
Cranes are one of the oldest of all __________ things, dating back millions of years.
The white Livorno, now re-named the leghorn, was __________ from Italy to the United States in the early 1820s.
Jumping spiders are visual hunters, and use their amazing vision to __________ and stalk their prey.
By all reckoning, the bumblebee is aerodynamically unsound and shouldn't __________ to fly.
Einstein's theory of special relativity states that nothing can travel faster __________ the speed of light.