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Doyle wrote this essay on June 12, 2012. Brian Doyle was experiencing his son having a life or death situation. Doyle writes this in the context of his son. He is inspired by his son to metaphorically explain about life that was almost taken from his son in a life or death situation. Brain Doyle's son was diagnosed with a congenital heart condition and had a missing chamber of the heart which was a problem. He was born in the year of 2003 and had taken years for the son, Liam, to recover from his heart condition.

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Brian Doyle was an author of many essays and novels.  Joyas Voladares is the lead piece in a collection of his essays titled One Long River of Sound: Notes on Wonder.  Brian lost his battle to brain cancer at the age of 60 in 2017. This message is important for Doyle, because his son had almost died from a congenital heart condition he contained from the moment he was born. It had taken years for the doctors to have finally healed him through multiple surgeries and procedures. Therefore, this piece evaluates the hearts of a hummingbird and a whale to further illustrate their lives as animals. This creates an idea to the reader about how life has its ups and downs either living a short or long life illustrated in the text.

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Doyle, an old man, believes that the reader should treasure all the moments in life, good and bad. Doyle's inspiration to write comes from his own son. His son has had a heart condition from the day he was born. This drove Doyle to write how life can either leave in an instant or be a long lasting life. His purpose was to inform his audience to understand how living life can be either very quickly or very long lasting by revealing the two examples of the tortoise and the hummingbird. The literal reason why the speaker had to write this piece was because of the experience he had with his son over many years to recover from a congenital heart condition.

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Young Adults who aren't as wise and experienced as the elderly. We know this, because young adults still have a long life awaiting them and they need the most advice possible for their future unlike elderly. Doyle tries to explain the full complexity of two ways to live a life as a human and narrows it down to examples of the hummingbird and a tortoise. The audience relates to this subject by trying to figure out how life works and looking for advice for a way to live.

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Doyle's purpose is to invoke his metaphoric examples in order to explain why it is important to live life to the fullest.
Doyle's reason behind this piece is his sons congenital heart condition who wants to write about a human life and provides examples of two hearts lifestyles everyday. The hummingbird has a symbolic meaning to the message that relates to the speaker's experience with his sons diagnosis. The hummingbird has many meanings like living a life with joy, happiness lightness, sweetness, but they also represent having overcome a difficult situation. This reveals a good reason why the speaker chose this animal as one of the examples for this piece and to get his purpose across to the young adults.

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Doyle writes in an informative tone to emphasize the lifestyles of both short and long in order to inform the young adults to realize the two forms of living life either fast and busy or slow and easy.
The three words that describe the tone in this text are figurative, didactic, and factual.
Two tone words the speaker uses in the text are ferocious and taut.
"Hummingbirds, like all flying birds but more so, have incredible enormous immense ferocious metabolisms." Doyle uses four tone words in this sentence to express the intensity of hummingbirds metabolism.
"Their arteries are stiffer and more taut." Doyle uses the tone word, taut, to characterize the arteries in the hummingbird dramatically for the young adults to realize the small, but mighty animal.
Yes, there are shifts in tone. They occur after each paragraph in the text, but mainly at the end paragraph.

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Doyle narrates the story of a hummingbirds life by explaining their heart conditions and short life span.
Doyle exemplifies the lives of hummingbirds with facts and examples about its many struggles through each day.
Doyle describes the details of life as a hummingbird including their hearts condition and how it works.

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Features (devices - figurative & syntactical, word choice, sentence structure)

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Features (devices - figurative & syntactical, word choice, sentence structure)

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Doyle's use of polysyndeton, naming each species of hummingbird as "...bearded helmet-crests and booted racket-tails, violet-tailed sylphs and violet-capped woodnymph, crimson topazes and purple-crowned fairies, red-tailed comets and amethyst woodstars...," to emphasize how many species of hummingbirds there are to further illustrate the importance of every human life on earth.
Doyle's use of metaphors, describing "Their hearts are stripped to the skin for the war against gravity and inertia, the mad search for food, the insane idea of flight. The price of their ambition is a life closer to death.." to emphasize the struggle of a hummingbirds everyday life and further illustrates a fast living life for some humans.
Doyle's use of personification, explaining how a hummingbird heart works is "To drive those metabolisms they have race-car hearts that eat oxygen at an eye-popping rate." to emphasize human actions to further create a realistic and clear way of looking at a hummingbirds metabolism.
Doyle's use of imagery, describing  a hummingbirds life as "Each one visits a thousand flowers a day. They can dive at sixty miles an hour. They can fly backwards. They can fly more than five hundred miles without pausing to rest." to emphasize the many things a hummingbird can do while also living a short life.
Doyle's use of anaphora, describing the action of flying as "You burn out. You fry the machine. You melt the engine." to emphasize the subject by repeating each word to bring into realization for the young adults.

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He appeals to the young adults with emotional attributes as "The price of their ambition is a life closer to death; they suffer more heart attacks and aneurysms and ruptures than any other living creature. It’s expensive to fly." to illustrate to the human person about living every moment in life like it was a jewel.
He appeals to the young adults with statistics about a hummingbirds heart as  "Each one visits a thousand flowers a day. They can dive at sixty miles an hour. They can fly backwards." to illustrate the importance of living life as a human to the fullest.
He appeals to the young adults with ethical phrases like "So much held in a heart in a lifetime. So much held in a heart in a day, an hour, a moment. " to illustrate how life can be gone in a blur or it can be a lasting life.

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In Brian Doyle's 2012 invigorating essay, "Joyas Voladares," explains the life of a hummingbirds heart to reveal that humans should value every moment in their life like it was a jewel. Doyle supports his explanations by narrating the lasting yet short life span of a hummingbirds life, exemplifies the factual evidence about the heart of a hummingbird, and describes the details of life as a hummingbird. His purpose is to highlight the two ways of life and how society lives either a short or long lifestyle. Doyle writes in a figurative tone to exaggerate the hummingbird and whale's lifestyle in order to create an idea about two different lives in society by evaluating each animals heart.