At this time of year in La Palma, you might hear rather unnerving Howie-howie-SKRAWK! noises in the night, something between a furious tom cat and a duck. You’re particularly likely to hear it near the sea.
The first time I heard it, I wasn’t exactly scared, but I was rather glad that I was inside a solid house and the whatever-it-was clearly outside. I’m sure I’d have felt decidedly uncomfortable about it if I’d been camping, especially in the dead of night. In fact, I’ve heard of people thinking it was the witches or the devil.
There’s an audio recording here. See what you think yourself. Now imagine that it’s dark and you’re half asleep.
Actually it’s just Calonectris diomedea borealis a nocturnal seagull called Cory’s Shearwater, or in Spanish a Pardela Cenicienta. Or you might have your romantic, sea-side stroll inturupted by a Manx shearwater, (Puffinus puffinus) which sounds like this. Again, it’s fine as long as you know what it is, and unsettling if you don’t.