A Boy and a Jaguar by Alan Rabinowitz

 Rabinowitz, A. (2014). A boy and a jaguar. New York: Houghton Mifflin Harcourt Publishing Company.
A Boy and a Jaguar is a Schneider award winner.
Alan loves animals, but the great cat house at the Bronx Zoo makes him sad. Why are they all alone in empty cages? Are they being punished? More than anything, he wants to be their champion—their voice—but he stutters uncontrollably.
Except when he talks to animals…
Then he is fluent.
Follow the life of the man Time Magazine calls, "the Indiana Jones of wildlife conservation"as he searches for his voice and fulfills a promise to speak for animals, and people, who cannot speak for themselves. This real-life story with tender illustrations by Catia Chien explores truths not defined by the spoken word.
Another book that is on the same topic as A Boy and a Jaguar is Neighborhood Sharks: Hunting with the Great Whites of California's Farallon Islands by Katherine Roy.
A few miles from San Francisco lives a population of the ocean's largest and most famous predators. Each fall, while the city's inhabitants dine on steaks, salads, and sandwiches, the great white sharks return to California's Farallon Islands to hunt their favorite meal: the seals that live on the island's rocky coasts. Massive, fast, and perfectly adapted to hunting after 11 million years of evolution, the great whites are among the planet's most fearsome, fascinating, and least understood animals.