This might be of related interest?
https://phys.org/news/2017-01-swamphens-dominance-fleshy.html
Robin Hide
-----Original Message-----
From: Elizabeth Compston
Sent: Friday, 31 March 2017 10:17 AM
To: Birds Canberra
Subject: purple swamp hens
Yesterday, from Bittern Hide we saw an aggressive swamp hen chasing another
swamp hen, then pushing it under water and trying to hold it's head under water
as it pecked it's head. The bird escaped but the chasing continued with more
swamp hens joining in. Unfortunately we were not able to stay long enough to
really sort things out; but there was no doubt about the aggressive behaviour.
Why such behaviour?
Elizabeth C
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