Species within the mammalian family Felidae present a unique opportunity to study the relationship between interspecies morphological and ecological variation due to their high phenotypic trait conservation. Despite a long list of shared characteristics, felids display tremendous diversity in body size, with an almost 300 kg difference between the largest and smallest species. However, extensive research into potential interactions of body size with other traits across felids as a whole has yet to be completed. In this review and collection of exploratory analyses, we examined whether variation in body size introduces ecological constraints on how felids use their common traits, particularly regarding ambush hunting behavior. We collated and explored metadata about numerous morphological and ecological characteristics (including average weight, prey selection and killing strategy, pelage characteristics, habitat preference, and conservation status) for all 41 currently recognized species. We found that felid body size influences prey selection and primary dispatch strategy, with larger felids employing suffocating throat bites while smaller felids preferred nape bites. We also found that larger body sizes seemed generally associated with lower prey capture rates, although data collection on more felid species is necessary to confirm whether this trend holds across the family. We further documented high variation in pelage characteristics and preferred habitat types, suggesting that the near universal need for camouflage in ambush predators exerts a stronger influence on pelage color and pattern than body size. Finally, we reported a relationship between body size and conservation status, as 100% of large species and 84% of small species are currently experiencing population declines. While midsize species fare slightly better with only 56% of species showing declines, all felids face significant threats from habitat loss and other anthropogenic pressures. By collating metadata and exploring patterns relating felid body size to ecological and behavioral traits alongside population trends and conservation status, we aimed to improve our understanding of these charismatic and ecologically important animals, while inspiring further study into the eco-evolutionary implications of body size.
