Capturing Zigbee Packets

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Hello.

I've been attempting to use Wireshark to sniff the Zigbee protocol that my XBees use. However, I haven't been able to capture any Zigbee protocol packets-only internet protocol ones. Does anyone know if it was at all possible to sniff this protocol solely using the Wireshark software or if there is other hardware/software I need to use in addition to Wireshark.

Thanks.