Bite-Size is a little brown bat that the Wild Kratts met in the Season 1 episode "A Bat in the Brownies".
Background[]
He was flying around the forest and the Tortuga HQ, catching bugs, until he landed and hid in Jimmy Z's brownie dish. Once he was found by the crew, they all got scared of him, except for the Kratt brothers.
Jimmy and Aviva were able to rethink their concept about bats, Aviva even went so far as to call Bite-Size 'delicious' (which meant she thought he was cute), but Koki kept being stubborn and mean about him (even expelling him from the HQ in the first opportunity).
However, she regretted the way she treated him after seeing Bite-Size and his bat friends homeless after lightning hit the tree they were living in and she eventually changed her mind. After the Wild Kratts sent a bat box plan to every Wild Kratts kid around, his friends found a new home quickly.
To apologize for her mean actions, Koki made her own bat box and set it up in the Tortuga for Bite-Size to live in.