They are considered Vulnerable at the species level, with an estimated world population of under 9,000 individuals.

The turnover in this group is clearly marked at the species level.

Macroevolution: the study of changes above the species level, and how they take place.

Taylor elevated this variety to the species level in 1971.

Further biochemical testing is needed to identify to the species level.

Average rates of change are calculated and aggregated to the species level.

It is possible that up to 10,000-20,000 pelicans exist at the species level.

It took 20 million years - more than 2,000 times the span of recorded human history - for species levels to recover.

The answer is yes for a few biologists who proposed one or more evolutionary mechanisms which worked above the species level.

They again recommended the recognition of molucca at species level.