RFI: egg predator advice - small terns

Subject: RFI: egg predator advice - small terns
Date: Wed, 19 Feb 2014 08:53:35 +1100
A request for list members familiar with small tern eggs damaged and/or 
eaten by predators.

I have photos of Fairy Tern egg shells taken at an apparently recently 
failed breeding colony off French Island Victoria.

As a member of the Friends of French Island National Park we monitor this 
threatened species breeding in Western Port.  The egg shell remnants 
appear to have been pierced by a beak (?) of a predator of some sort.  We 
are aware that Barn Owls and possibly feral cats visit the breeding area 
at times but are unsure of whether ravens may also be a problem.  Silver 
Gulls also visit the area occasionally.  Some of the holes in the egg 
shell remnants are too small to be either gull or raven ..

Would those people familiar with egg damage contact me directly so I can 
pass on the images for their thoughts?

cheers, Martin

Martin O'Brien 
Wildlife Biologist, Catchment Governance & Legislation
Department of Environment & Primary Industries
8 Nicholson Street, 
East Melbourne  VIC  3002


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