Quote:
Originally Posted by Little Sparrow
Possibly one or both of the parents were predated or they were inexperienced parents, hard to say what could be the cause. Sad to hear. Leave the box untouched as it is illegal to clean out nest boxes during the breeding season.
This link gives a lot of information: Frequently asked questions | BTO - British Trust for Ornithology
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Didn't know that was illegal assuming you know the chicks may be dead.
But Blue Tits can clean out themselves if they wish to take over the nest.
They do clear out any dead chicks that die in their brood so if others want to take over, then they will clean it out themselves.
Don't think it would make it very appealing mind you if dead chicks are there