蹼

pǔ
web (of feet of ducks, frogs etc)

CEDICT

web; the membrane-like part between toes or fingers (of animals)

Wiktionary

Containing this entry

半蹼鹬 bànpǔyù (bird species of China) Asian dowitcher (Limnodromus semipalmatus)
灰瓣蹼鹬 huībànpǔyù (bird species of China) red phalarope (Phalaropus fulicarius)
红颈瓣蹼鹬 hóngjǐngbànpǔyù (bird species of China) red-necked phalarope (Phalaropus lobatus)
脚蹼 jiǎopǔ
  1. flippers
  2. fins