Photos: Fiona the hippo celebrates 4th birthday
Fiona, the Cincinnati Zoo's beloved hippo, is celebrating her fourth birthday. Walk down memory lane with these photos of Fiona over the years.

Fiona, a Nile hippopotamus, plays in her enclosure at the Cincinnati Zoo & Botanical Garden on Nov. 2, 2017, in Cincinnati. She was born six weeks prematurely at 29 pounds, well below the common 50- to 100-pound range, and required nonstop critical care by zookeepers to ensure her survival. (AP Photo/John Minchillo)

Fiona, a Nile hippopotamus, eats her specialty birthday cake to celebrate turning three years old at the Cincinnati Zoo & Botanical Garden in January 2020. The Cincinnati Zoo used her third birthday as a way to raise money for Australian wildlife affected by bushfires. Instead of sending birthday gifts, the zoo asked people to buy T-shirts to directly benefit the Bushfire Emergency Wildlife Fund. (AP Photo/John Minchillo)

Fiona, a Nile hippopotamus, swims after eating her specialty birthday cake to celebrate turning three years old in her enclosure at the Cincinnati Zoo & Botanical Garden in January 2020. (AP Photo/John Minchillo)

Fiona, a baby Nile hippopotamus, walks through her enclosure at the Cincinnati Zoo & Botanical Garden on Jan. 10, 2018. (AP Photo/John Minchillo)

This still image taken from video provided by WLWT News 5 Cincinnati shows Fiona the hippopotamus at the Cincinnati Zoo on Jan. 30, 2020. Zoo keepers placed two “enrichment” toys in front of her, marked with the logos of the Kansas City Chiefs and the San Francisco 49ers. While the plan called for Fiona to nudge one of the items with her snout to indicate her Super Bowl pick, she instead threw up her choice on the Chiefs' item, WLWT-TV reported. (WLWT News 5 Cincinnati via AP)

Fiona the hippo swims through her enclosure as visitors look on at the Cincinnati Zoo & Botanical Garden, Jan. 10, 2018, in Cincinnati. (AP Photo/John Minchillo)

In this June 26, 2018, photo, Fiona swims above her mother Bibi in their enclosure at the Cincinnati Zoo & Botanical Garden. The Cincinnati Zoo's globally famous premature hippo does more than help sell T-shirts, bobbleheads and ice cream. She is becoming a teaching tool in classrooms and libraries and subject of a series of books. (AP Photo/John Minchillo)

In this June 26, 2018, photo, Fiona the hippo sleeps in her enclosure beside a copy of the book "Saving Fiona" at the Cincinnati Zoo & Botanical Garden. (AP Photo/John Minchillo)

In this June 26, 2018, photo, Fiona, a baby Nile hippopotamus, sleeps as visitors stop by her enclosure at the Cincinnati Zoo & Botanical Garden in Cincinnati. (AP Photo/John Minchillo)

In this June 26, 2018, photo, Fiona the hippo sleeps as visitors stop by her enclosure at the Cincinnati Zoo & Botanical Garden. (AP Photo/John Minchillo)

In this June 26, 2018, photo, Fiona, a baby Nile hippopotamus, swims in her enclosure at the Cincinnati Zoo & Botanical Garden. (AP Photo/John Minchillo)

Fiona, a Nile hippopotamus, eats her specialty birthday cake to celebrate turning three years old in her enclosure at the Cincinnati Zoo & Botanical Garden in January 2020. (AP Photo/John Minchillo)

Fiona, a Nile hippopotamus, plays near visitors after eating her specialty birthday cake to celebrate turning three years old at the Cincinnati Zoo & Botanical Garden in January 2020. (AP Photo/John Minchillo)

Fiona, a Nile hippopotamus, left, shares her specialty birthday cake with her mother Bibi, right, to celebrate turning three years old at the Cincinnati Zoo & Botanical Garden in January 2020. (AP Photo/John Minchillo)

Fiona, a Nile hippopotamus, center, plays with her mother Bibi, right, in their enclosure at the Cincinnati Zoo & Botanical Garden on Nov. 2, 2017. (AP Photo/John Minchillo)

Fiona, a baby Nile hippopotamus, right, and her mother Bibi swim in their enclosure at the Cincinnati Zoo & Botanical Garden on Jan. 10, 2018. (AP Photo/John Minchillo)

Fiona, a baby Nile hippopotamus, has her gums rubbed by a zookeeper in her enclosure at the Cincinnati Zoo & Botanical Garden on Jan. 10, 2018. (AP Photo/John Minchillo)