Now under the care of wildlife experts, the hoglets are being rehydrated and hand-fed as they recover from their ordeal.
Once they have regained their strength and are fit enough to survive independently, they will be released into suitable hedgehog-friendly habitat on the mainland.
The MV Loch Seaforth, which serves the Ullapool route (Image: Colin Mearns)
The pair were not the only unusual passengers on the crossing.
They were accompanied by another young hedgehog and an injured rock dove, both travelling to the mainland for treatment and rehabilitation.
Wildlife transfers are a regular feature on the Stornoway to Ullapool route, which provides an important connection between the Western Isles and specialist animal care facilities. Just last week, the service carried two seal pups requiring rehabilitation.
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A CalMac spokeswoman said: “Our ferry services provide a vital lifeline for island communities, and occasionally that includes helping vulnerable wildlife reach the specialist care they need.
“We are delighted that these hoglets are now receiving treatment and wish them, along with their fellow animal passengers, a full and speedy recovery.”
The journey highlights the wider role ferry services can play in supporting wildlife rescue efforts, helping injured and vulnerable animals from Scotland’s islands access expert treatment and rehabilitation on the mainland.