In this model changes to the histone tails act indirectly on the DNA.

Experiments suggest that the males' tails act as advertising for good genes because males must be in good health to spend the energy growing them.

Hence, when the animal was running the tail could have stretched back horizontally and acted as a balancing organ.

The tail acts as a fifth limb.

"It seemed like the tail wasn't acting right," he said.

The animal's long tail probably acted as a counterweight to its body mass.

Its tail was acting as though it bore a poison sting, but the creature didn't try to use it.

Its prehensile tail acts as a fifth appendage and aids in climbing.

These tails, made of the protein called actin, act like jets to propel the bacteria around inside the cell.

The ski tips or tails act as a slippery pivot point.