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json - Why struct fields are showing empty?

I am struggling to get the correct output from the following code:

package main

import (
    "encoding/json"
    "fmt"
)

func main() {

    var jsonBlob3 = []byte(`[
        {"name": "Platypus", "spec": "Monotremata", "id":25 },
        {"name": "Quoll",    "spec": "Dasyuromorphia", "id":25 }
    ]`)
    type Animal2 struct {
        name  string
        spec string
        id uint32
    }
    var animals []Animal2
    err := json.Unmarshal(jsonBlob3, &animals)
    if err != nil {
        fmt.Println("error:", err)
    }
    fmt.Printf("%+v
", animals)
}

Playground snippet

The struct fields are empty when printed. I am sure there is a dumb mistake somewhere but I am still new to Go and I have been stuck at this for hours. Please help.

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