Orangutans have also been observed using sticks to measure the depth of water.

Other corpsman have been observed using traditional weapons, such as firearms.

This species has also been observed using yawns as threats.

Birds have been observed using the species as a source of food.

If the material is large enough, this can be observed using an electron microscope.

To date, 33 bird species have been observed using refuge lands and waters.

Eon very probably had other physical powers than he was observed using.

Many objects are best observed using higher magnifications, which inevitably go along with narrow fields of view.

In up to five different depths, the water velocity is observed using rotor current meters.

He has just been observed using the laboratory computer for access to the commercial channels.