rebdesysince lujvo

x1 is a rattlesnake of species/breed x2.

See also since, pitxona, krotalo.

In notes:

krotalo
x1 is a rattlesnake of Crotalus genus.
vidysince
x1 is a venomous snake of species/breed x2
virperi
x1 is a viper (family Viperidae) of species/breed x2.