What doesn't a cat have? - briefly
A cat does not have hands or thumbs, which distinguishes it from humans and other animals with opposable digits.
What doesn't a cat have? - in detail
Cats, despite their popularity and familiarity, lack several features that are present in other animals or even in humans. One of the most notable absences is the ability to taste sweetness. Cats are unable to detect sweet flavors due to a genetic mutation in one of the taste receptor genes. This adaptation might be linked to their carnivorous nature, as sweet foods are typically associated with plants and not part of their natural diet.
Another significant absence in cats is the ability to sweat extensively. While humans have sweat glands all over their bodies, cats primarily sweat through their paws. This limited sweating mechanism is a result of their evolutionary history as desert animals, where conserving water was crucial for survival. Instead of sweating, cats regulate their body temperature by grooming and panting.
Cats also lack opposable thumbs, which are common in primates like humans. Opposable thumbs allow for a greater range of motion and gripping capabilities. In contrast, cat paws have retractable claws that help them climb and grasp objects, but they do not possess the same dexterity as humans when it comes to manipulating small items with their paws.
Moreover, cats lack the ability to metabolize certain substances effectively. For instance, they are unable to break down some compounds found in plants, such as oxalates, which can lead to health issues if ingested in large amounts. This is why a cat's diet should predominantly consist of meat and not include many plant-based foods.
Lastly, cats do not have the same capacity for emotional expression as humans. While they can display a range of emotions through body language and vocalizations, their facial expressions are more limited compared to humans. This is due to differences in muscle structure and the way emotions are communicated between species.
Understanding these absences provides valuable insights into the unique physiology and behavior of cats, highlighting how they have evolved to thrive in specific environments and roles.