Portrait of a lion (Panthera leo) resting on a rock and looking at the photographer in the Serengeti, Tanzania

panthera leo lion panthera leo rock stone adult male alone head mane glance lie down rest fatigue portrait front shot carnivore diet serengeti national park look panthera vulnerable national park unesco's world heritage cites appendix 2 october nobody lions rocks stone adults males single lonely only solo one lone heads manes glances looking at camera going to bed lengthened stretched out lengthen lengthening bedtime stretching out stretch out go to bed laying down siestas resting siesta rested restful make the siesta making the siesta being lazy be lazy exhaustion exhaustions tired tireness exhausted exhaust tiring exhausting portraits front views front sights front sight front shots front view carnivorous animal carnivores diet carnivorous animals meat eating animal meat eating animals serengeti looked looking vulnerable species national parks sensitive natural areas world heritage site with nobody big cat wildcat feline carnivoran mammal therapsid synapsid vertebrate chordate wild animal animal rock fragment mineral matter stage of development individual general morphology organism morphology zoology posture health diet pattern species tanzania east africa africa felidae carnivora mammalia cynodontia therapsida eupelycosauria synapsida tetrapoda tetrapodomorpha rhipidistia sarcopterygii euteleostomi gnathostomata vertebrata chordata deuterostomia coelomata bilateria metazoa opisthokonta eukaryota threatened endangered species iucn red list of threatened species environment protection environment management biodiversity management environment convention on international trade in endangered species of wild fauna and flora cites)