Beebe and Barton conducted dives in the Bathysphere together, marking the first time that a marine biologist observed deep-sea animals in their native environment.

Human biologists could learn about extraterrestrial biochemistry and observe how it differs from that found on Earth.

A biologist named Jarman observed among modern ungulates correlations between "ecological variables including feeding style, body size, group size, home range, antipredator behavior, growth pattern, and social organization."

In the 19th century, biologists observed the insects without breaking open the amber, and classified them by physical features.

Such instruments, their inventors say, will allow biologists to directly observe microscopic processes that control reproduction, resistance to disease, and many other physiological functions that doctors and scientists seek to understand.

From a hill on the island off San Francisco the biologists observed the surface behavior of the whales in 84 trials.

In 2002 Aplomado Falcons were released on several private ranches and in 2007, biologists observed the fledging of wild falcons in West Texas for the first time in more than 70 years.

But biologists have observed that a change of 0.3 in the pH level in the blood of some deep sea creatures can halve the amount of oxygen.

Although they are wingless, biologists have observed them gliding.

But several evolutionary biologists observe that if the South Florida environment previously selected for unique behavioral and physical traits, it will continue to do so.