Hello Danielle,
referring to Stefan Brücher´s last statement, nothing is lost for this season because of appearance of the foxes.
http://webcam.pixtura.de/SWR_UHU/artikel_de.php?id=125
He writes that observations of EGE Eulen during many years show, that Eagle Owls in mild regions begin to breed as the first. But now in late winter even from this first ones only a third of them has already begun to breed. The area with the webcam here on the ledge is not one with a very early begin of breeding. Referring to the years before, one can reckon Lotte beginning to breed only since midst of March.
Stefan Brücher writes further, that we humans think that the foxes might be very threatening for the owls, like a lion would be for us humans. But also in the previous years the owls were not very impressed by the foxes and will chase them away when necessary.
Eagle owls have advantage over foxes and act quite relaxed - they are in general quite cool. They most fear humans, but only during daytime. During dusk and night they can even chase humans, which are close to the nest, away.
He writes we can stay confident and relaxed concerning the future of Lotte and Leo and we should meanwhile enjoy to observe the foxes
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Translation as good as I can ;)