For those who may not know:
Grrr is a T-Rex and was in 7 grade for many years..(our class dino)
Gretta is his wife. She is a Raptor(don't be fooled by the movie Gretta is bigger in real life). They met at a showing of Jurassic Park. Grrr Jr is their son and Little Gretta his sister.
from time to time other dino friends visit.
Roar-roar meow is a saber tooth tiger and friend of Grrr. 
Being a good and proper mom, like Gretta, she is very protective of her kittens