Sentence examples for difficult species from inspiring English sources

He has had collaborators scouring Kazakhstan and Russia for diseases that evolved with two especially difficult species, spotted knapweed and leafy spurge, and some have been shipped to the United States where they remain in a containment facility in Maryland awaiting approval to be used in testing.

For the first leg of our three-week trip, we've chosen to focus on a species that is supposed to be abundant and easy to find, the variable-scaled anole, Anolis heterodermus; we're postponing the search for the more difficult species until later.

Complex behavior and physiological characteristics make hippos a difficult species to manage.

Zoo curator Sarah Foster said the leafcutter ants were the most difficult species to count at about 500,000.

The first successful rabbit SCNT was achieved more than one decade ago, yet rabbits remain one of the most difficult species to clone.

However, because tigers occur at low densities and tend to inhabit remote, rugged, and inaccessible habitat, and are one of the most difficult species to capture, telemetry is also perhaps the hardest and most expensive way to study tigers.

While the famed constructors said they were paid "unusually well" for The Puzzler — one of an extra-difficult species of puzzle known as a cryptic — standard fees for puzzle authors top out at about $200 a pop.

They regard goldens as one of the most discerning, difficult trout species.

Results are exemplarily shown for a difficult bird species (jackdaws) and an easy scenario (tinamous).

Generally, it is difficult for species identification of sea cucumbers based on morphological characterization.

See also: Nepenthes cultivation Nepenthes rajah has always been considered to be one of the more difficult Nepenthes species to cultivate.