On the island of Tenerife in the Canary Islands many residents have reported being bitten by small black jumping spiders. These bites are said to be so serious they need urgent medical attention .
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Bugs (like mosquitoes, ticks, and fleas) can spread a number of diseases in the Canary Islands. Many of these diseases cannot be prevented with a vaccine or medicine. You can reduce your risk by taking steps to prevent bug bites.
Plenty of lizards, skinks and geckos, but these are inoffensive. There are no snakes indigenous to Tenerife, however the Canary Islands faced an issue few years ago with California king snakes that were introduced on the islands by someone as a pet, but ran away into the wild and reproduced.
What to be wary of in Tenerife? Because of its volcanic background, most beaches in Tenerife are volcanic with black sand which can be hot under the feet. If you're after a traditional sandy beach head to Los Cristianos and leave the southern resorts alone. Playa la Arena is also notorious for pickpockets.
Sharks. Tenerife and Gran Canaria are one of the few remaining locations with a substantial population of angelsharks. It is quite a common sight while snorkeling. The basking shark, a harmless plankton feeder, visits the island in large groups during the winter, but is rarely seen.
The water on the coast of Tenerife is not particularly warm, but you can still swim, even during the winter months. On the other hand, the lower water temperature (due to cold currents) provides excellent natural protection from dangerous sea creatures.
Tenerife is a stunning holiday destination with all year round sunshine. The climate is perfect for open water swimming in the Tenerife sea, where average air temperatures range between 17 C and 24 C with sea temperatures rarely dropping far below 20 C.