In a tree.
Right over the mouth of the volcano.
Sylvia can only mutter to her drink: "Wait for me, tiny umbrella".
The running gag is the momma bird keeps biting them to protect her young. (She thinks Wander and Sylvia are attacking her chicks.) The bird also delivers an electric shock which illuminates their skeletons.
Wander compliments Sylvia on her bravery and ingenuity.
Thanks again to-