The call is a harsh swizzling, similar to other weavers.

Swizzling of the pointer allows for classes to change at runtime.

It gives a jumbled mix of shrike-like swizzling sounds including some imitations and a harsh Dzzzttt-dzzzt-dzzzt alarm call.

In computer science, pointer swizzling is the conversion of references based on name or position to direct pointer references.

The call is a "high-pitched, rasping, buzzing swizzling, somewhat insect-like: zzzzzzz, zzit, zzit, zzzz".