Japanese stork
鸛 refers specifically to the Japanese stork, a large wading bird. The meaning is narrow and concrete, with no abstract extensions.
鸛 combines 雚 (a phonetic component associated with storks or herons) with 鳥 (bird), forming a phono-semantic compound for the stork.
The left side 雚 resembles a stork's long neck and crest, while the right side 鳥 confirms it is a bird. Together they make the Japanese stork.
For カン, picture a stork standing in a can: can -> カン, and the stork's long legs fit perfectly inside.
shoebill (Balaeniceps rex)
white stork (Ciconia ciconia)
maguari stork (Ciconia maguari)
woolly-necked stork (Ciconia episcopus); whitenecked stork
black stork (Ciconia nigra)
Abdim's stork (Ciconia abdimii); white-bellied stork
jabiru (Jabiru mycteria)
Oriental stork (Ciconia boyciana)