* Availability: Leeches are opportunistic feeders and will latch onto whatever is available to them. This means they may target thin-skinned animals simply because those are the animals they encounter most readily.
* Size: Young leeches are small and need to consume relatively small amounts of blood at a time. Smaller animals, regardless of skin thickness, may be easier for them to attach to and draw blood from.
* Movement: Young leeches are weaker and less agile than adults. They may struggle to attach to large, strong animals that are able to move away quickly.
It's important to note that all leeches, regardless of age, are generally attracted to warmth, movement, and vibrations, which are often associated with prey animals.
In summary, young leeches don't specifically target thin-skinned animals. Their prey selection is based on factors like size, availability, and their own physical limitations.