- Iberian Green Frog
- Iberian Scarce Swallowtail
- Iceland Gull
- Immigrant Pavement Ant
- Imperial Moth
- Inca Dove
- Indian Garden Lizard
- Indian Milkweed Bug
- Indian Peafowl
- Indian Pond-Heron
- Indian-Meal Moth
- Indigo Bunting
- Indigo Dropwing
- Indo-Pacific Sergeant Major
- Indomitable Graphic Moth
- Io Moth
- Ipsilon Dart Moth
- Isabella Tiger Moth
- Italian locust
- Italian Sparrow
- Italian Wall Lizard