1. Crocodiles:
Alligators and crocodiles were sometimes placed in moats in warm regions of Europe, such as southern France, Italy, and even England. These reptiles served as formidable deterrent to potential attackers, as their size and strength could inflict serious injuries.
2. Snakes:
Various types of snakes, including venomous species, could be found in moats. Their presence added an extra layer of danger for anyone attempting to cross the moat.
3. Fish:
Moats often contained fish, which could provide a food source for the castle's inhabitants during sieges or times of limited supplies.
4. Turtles:
Aquatic turtles could also be found in moats. While they were not considered a threat to humans, they could add to the moat's defenses by making it more difficult for enemies to gain a foothold in the water.
5. Amphibians:
Frogs and other amphibians might inhabit moats, particularly in shallow and marshy areas.
6. Aquatic Insects:
Dragonflies, damselflies, and other aquatic insects were likely to be present in the moat's ecosystem, contributing to its overall biodiversity.
It's important to note that moat were not just filled with animals for defense purposes. They also played a role in landscaping and aesthetics, with certain species chosen for their appearance and ability to enhance the overall ambiance of the castle or fortifications.