Coyote sounds on this page are a pack howl, a mix of yips and howls, and a pup growl. Each card has the recording, a spectrogram and what the National Park Service says coyote calls are for.
Coyote sounds and what they mean
Pack howl

The barks, yaps, yips, growls, and howls are a means of communication to help keep the band together.
Recording by Rybkovich, licensed CC BY-SA 4.0 (original file)
Yips and howls

The barks, yaps, yips, growls, and howls are a means of communication to help keep the band together.
Recording by Jennifer Jerrett, Yellowstone National Park Sound Library, licensed CC BY-NC 4.0 (original file)
Pup growl

The barks, yaps, yips, growls, and howls are a means of communication to help keep the band together.
Recording by Jeff Rice and Montana State University, licensed CC BY-NC-ND 3.0 (original file)
Why coyotes howl and yip
The National Park Service (Big Bend National Park) says the barks, yaps, yips, growls and howls of coyotes “are a means of communication to help keep the band together”. That covers all three cards: the howl, the yips and the growl are all on that list.
Where these recordings come from
The pack howl was recorded by Rybkovich (CC BY-SA 4.0). The yips and howls come from the Yellowstone National Park Sound Library, recorded by Jennifer Jerrett (CC BY-NC 4.0). The pup growl was recorded by Jeff Rice and Montana State University (CC BY-NC-ND 3.0). The last two come from the Acoustic Atlas. Each card links the original file and its licence.