Salamun Alaikum,
I noted in the section concerning birds that:
"There is an interesting argument here that has merit. Livestock lawfulness is limited to grazing animals (herbivores) as noted above. Therefore animals that eat other animals (carnivorous and omnivorous) are forbidden from simple deduction. Therefore applying the same principle, one could argue that hunting predatory and scavenger birds that also eat dead carcasses and other animals are also forbidden on the same grounds"
One would arguably apply the same principle to other creatures such as amphibians and wider tetrapods.
I hope that helps, God willing.
Joseph.