The litter size is probably small, judging by related species.

The financial impact cause by invasive species is 138 billion dollars per year with economic loss and control costs.

The invasion of the habitat by introduced species is a threat to this plant.

The differences in climate from south to north create several major forest zones, characterized by different species.

Each group had a leader who tallied the results, by species.

North and South America, the latter, by far being the most species rich.

The age of sexual maturity varies by species and gender.

I gave up trying to classify things by species and just ate.

The arms and sometimes other body parts are prepared in various ways, often varying by species.

The tree is sometimes killed, though less often, by other species of Phytophthora.