Au/Aw is for the Awesome Auk

Au is for Auk and the way these two are coming together they are almost forming a capital "A."

John James Audubon [Public domain], via Wikimedia Commons.

 

Once I flip this picture in the opposite direction at home on my Mac it will look like an small "a" facing in the right direction.

 By Archibald Thorburn (d. 1936) [Public domain], via Wikimedia Commons

Ar is for Aardvark

Ar makes the sound in the beginning of Aardvark, and we can imagine a capital "A" framed in the body of this Aardvark standing up tall:

By John Goodman (Aardvark) [CC-BY-SA-2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons.

Ar like in Aardvark is also sometimes just a small letter "a" like we can imagine framed around this little adorable aardvark's face and ear:

A+(I awe you! into a long A sound) is for the Aye-Aye Monkey

A is for Aye-Aye, so imagine a capital "A" in the shapes in this picture as the Aye-Aye stands tall:

 

By Henry Ogg Forbes (1851-1932) [Public domain, Public domain or Public domain], via Wikimedia Commons.

 

A is for Aye-Aye, so imagine a small "a" in the shapes in this picture:

This image (or other media file) is in the public domain because its copyright has expired.

A is for Aye-Aye, so imagine another small "a" in this picture if it's not too scary:

 

 

By Tom Junek (Own work) [CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons

A is for Alpaca

The capital "A" is hidden in the legs and shadows of the Alpaca's large body:

 Tram2 from nl [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/)], from Wikimedia Commons

The small "a" is just a face picture of this little affectionate one:

By Diligent Terrier (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0-2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons