Biologists have suspected for years that certain flamboyant features among males, like the peacock's Technicolor tail and the bullfrog's booming moonlight sonatas, evolved for no other purpose than to allow males to curry favor with females.

Biologists have suspected a genetic bottleneck - a sharp reduction in genetic diversity - in the decline of other animals like the cheetah, the Florida panther and the black-footed ferret.

Biologists at the zoo suspected an aquatic fungus, so they found Dr. Longcore through a Web search and mailed her a tissue sample.

Biologists suspect that raptors, unlike smaller songbirds, may indeed be monogamous, in part because they are long-lived species in which males invest considerable energy caring for their offspring and mates.

Biologists have long suspected that one of the cell's methods for controlling chromatin was adding acetyl groups to open the chromatin and removing the groups so as to repress the underlying genes.

Biologists suspect that it was introduced to Yellowstone by a tourist's infected dog or a coyote.

Biologists had long suspected that mitochondria originated from bacteria that had been incorporated as endosymbionts ("living together inside") of larger eukaryotic cells.

Biologists suspect that only a handful of genes are responsible for the major changes that reshaped the apelike ancestor of both species into a human and that these genes should be identifiable by having evolved at a particularly rapid rate.

Biologists have suspected for years that some positions on the DNA, notably those where it bends most easily, might be more favorable for nucleosomes than others, but no overall pattern was apparent.

Biologists suspect that the vigorous interaction between the vine and the butterfly over millions of years may have been a driving force in each group's evolution.