Surprising increase in dolphin sightings off the region's coast

• Video report by Andy Dickenson

It may only be the first throes of May, and the temperatures outside perhaps not quite as high as we were hoping, but the region has already been witness to a surprisingly high number of dolphin sightings.

Thankfully many have been caught on video though one circulating of a shark off Brighton is - experts say - almost certainly a hoax.

Three weeks ago, fishers even caught this rare glimpse of a calf swimming two miles off Littlehampton, but along with the spectacle should we also have some unease?

The most likely explanation for this recent spike in dolphin sightings is climate change - with our waters warming and the dolphin's prey changing course, even during winter.