Spider monkey, realizing he has been observed. 

Spider monkey, planning perilous theft from the other spider monkey in the foreground. 

Jaguar again, because God -- look at that thing! 

Jaguar, relaxing. 

My nephew, going in for the high five. For the record, he did get me on the rebound. 

My nephew. Awww. 

Polar bear, taking time out of fantasizing about devouring the crowd to cool off. 

Lion, eyes rolling back from the heat. 

Giraffe, looking relaxed. 

Giraffes, patrolling the perimeter. 

Giraffe, aloof. 

Giraffes, formation flying. 

Giraffe, making himself accessible. 

Gorilla, trying his best to ignore the gawkers. 

Gorilla, in sweet repose. 

Hippos, at lunch, reverse angle for maximum view of the chewing. 

Hippos, at lunch. 

Elephantine eyelashes. 

Elephant, looking dry. 

Elephant, with just a little something caught in her teeth, there. 

Tiger, about to test whether it is cooler on the other side of the fence. 

Tiger, wondering if it's any cooler on the other side of the fence. 

Tiger, turning his gaze towards us. 

Tiger, with intensity. 

Sumatran tiger, hiding in the shade.