I is for Iguana

My Alphabet Animals series of paintings continues with an iguana.  Back in college I had an iguana named Alex.  I once even composed a poem for him:

Alex...
in a cage of wire
With small, odd hands
he climbs up higher
Long green fingers,
sharp black nail
Scaling upwards,
followed by tail
Does he want
to be let free?
Is his home like
a penitentiary?
I open his door
but begin to doubt
Because he stays in
and sticks his tongue out.