A special barrier that will be built to protect rarebats will cost £100m, according to the chairman of HS2 Ltd.
Sir Jon Thompson told a rail industry conference the bat protection structure in Buckinghamshire was needed to appease Natural England, as bats are legally protected in the UK.
The 1km (0.6 mile) curved barrier will cover the tracks alongside Sheephouse Wood near Calvert in Buckinghamshire, to prevent bats being disturbed by high-speed trains.
Sir Jon said there was "no evidence that high-speed trains interfere with bats".
"We call it a shed," he said. "This shed, you're not going to believe this, cost more than £100m to protect the bats in this wood."
Natural England said it had not required HS2 to "adopt this structure", but its role had been to "comment on whether the proposed mitigations will work".
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