Furthermore, many groups which survive mass extinctions do not recover in numbers or diversity, and many of these go into long-term decline, and these are often referred to as "Dead Clades Walking".
S druge strane, mnoge grupe koje prežive masovna izumiranja se nikada ne oporave u pogledu brojnosti ili raznolikosti, a mnoge od njih ulaze u dugi period stagniranja, koji neki zovu periodom „hodajuće mrtve kladistike”.