Is there animals in grassland?
I think that you mean 'Are there animals in the Grassland?'
This is because you forgot to use the Subjunctive. Making the
sentence grammatically incorrect.
But answering your grammatically incorrect question 'Is there
animals in grassland?'
Yes, there are, however they rely on the moist grass and rich
tree leaves to stay alive, a typical grassland animal might be a
Rabbit or Mouse.