Small RNAs called piRNAs provide a first line of defense against the viruses.

The finding that a bacterium within a bacterium within an animal cell cooperates with the host on a biosynthetic pathway suggests the endosymbiont is, practically speaking, an organelle.

Genetically engineered Drosophila withstand toxins common in monarch butterflies’ diet.

It could be a throwback to a mechanism that induces ovulation during sex, researchers propose, but not everyone thinks the results can be extrapolated to people.

DNA analysis of a bizarre, 30-year-old whale skull serves as a reminder of the secrets that museum specimens keep about the natural world.

Scientists uncover a potential reason why redder house finches have better health.

Researchers recovered eight species from the salty, alkaline environment—increasing the known biodiversity of animals in the California lake five-fold.

The same study also finds there are three species of Electrophorus, rather than one.

Scientists injected unfertilized anole lizard eggs with CRISPR-Cas9 to produce albino offspring.