The two show differences in habitat preference and have allopatric distributions.
2.
The yellowhead and the whitehead have allopatric distributions as, conversely, the latter is found only on the North Island and several small islands surrounding it.
3.
Overall, the species have contiguous, parapatric ranges; only the northern crested newt and the marbled newt occur sympatrically in western France, and the southern crested newt has a disjunct, allopatric distribution in Crimea, the Caucasus, and south of the Caspian Sea.
मोबाइल