>>529294for the kangaroo rat there is a Jerboa in VOG 2, it's not a kangaroo rat but maybe it's close enough for you.
For the whale there is one in origami sculpture by Montroll but maybe it's too simple for you, anyway you should look it up.
for the elephant and the giraffe there is a lot of stuff in fact. Try tanteidan book 18 for the giraffe, it's pretty cool. And VOG 1 for the elephant for example. if this is too hard for you maybe try safari origami, there is a giraffe and elephant and even a lion.
For the cockroach i don't know, maybe try origami insect of robert j lang, or if you want a simple model of insect this one is the simplest i know :
https://www.youtube.com/watch?v=F-zQOAwSuHg>>529334same as you, every origami lion i've found look more like a dog with a mane rather than a real lion (ie, a big cat with a mane), the only really lioncurves-like origami i've found is pic related and it was invented by a guy who didn't know how to make diagrams so...
