On the other hand, there are species which look absolutely identical, but which do not breed together (sibling species).

This relatively recent discovery of sibling species is very important, and their numbers are growing rapidly.

Many sibling species will arise and lineages will branch.

It is a lost sibling species that I wonder about and wish to imagine.

These aren't sibling species, sir, these are co-sexes of the same species.

The important thing to note is that sibling species are in fact separate biological species.

They are our sibling species, who share with us between 96 and 99 percent of their genetic code.

According to some authors, A. dentiger may be considered a complex of sibling species or cryptic species .

In China several sibling species occur.

This finding has allowed the proportion of different sibling species in a fish to be used as an indicator of population identity in fish stocks.