Rehearsal Alphabet

Currently, my ensemble is working on a piece that has rehearsal letters up to H.  Last week, we had several cases of me saying, play from C, and half the group playing from E (for example).  One girl tried to work out a Letter for Animal alphabet.  This week, she'd got a working list up to H.  While choosing a sticker afterwards, she told me what they were:

A is for Ant
B is for Bee (B is?  yes, for Bee, as in, you know, a Bee - for reduction of confusion, this might turn into B is for Bumblebee)
C is for Cat
D is for Dog
E is for Elephant
F is for Frog
G is for Giraffe
H is for Hippo

I hope I can remember all these next week!  I'm curious what 'I' would be...