Sandesh Kadur / Wide angle shot of a Brown fish owl (Bubo zeylonensis) perched in a tree looking around, Ranthambore National Park, Rajasthan, India. 2016.

Luke Massey / Pel's fishing owl (Scotopelia peli) in South Luangwa, Zambia.

Mary McDonald / Pel's fish owl (Scotopelia peli) perched, Okavango Delta, Botswana.

David Pattyn / Brown fish owl (Ketupa zeylonensis) at rest, Ranthambore National Park, Rajasthan, India

David Pattyn / Brown fish owl (Ketupa zeylonensis) at rest, Ranthambore National Park, Rajasthan, India

Tony Heald / Pel's Fishing owl (Scotopelia peli) lit by vehicle headlights at night, South Luangwa National Park, Zambia

Steve O. Taylor (GHF) / Buffy fish owl (Bubo ketupu),which raids fishing catch, Gunung Palung National Park, West Kalimantan, Indonesian Borneo. July 2010.

Andy Trowbridge / Brown Fish Owl (Ketupa zeylonensis) perched in tree. Bandhavgarh National Park, India. March.

Loic Poidevin / Brown fish owl (Ketoupa zeylonensis) perched, Ranthambore National Park, India.

Will Burrard-Lucas / Pel's fishing owl (Scotopelia peli) perched at night, South Luangwa National Park, Zambia. May.

Pete Oxford / Pel's fishing owl (Scotopelia peli) perched at night, Okavango Delta, Botswana

Nature Production / Blakiston's Fish Owl {Bubo / Ketupa blakistoni} catching Big-scaled redfin {Tribolodon hakonensis} with its claws underwater, Hokkaido, Japan

Konrad Wothe / Barn Owl (Tyto alba) flying, North America

Pete Oxford / Pel's fishing owl at night, Okavango Delta, Botswana, Africa.

Pete Oxford / Pel's fishing owl {Scotopelia peli} feeding on fish, Okavango Delta, Botswana

Pete Oxford / Pel's fishing owl showing nyctating membrane, Botswana Moremi Wildlife Reserve

Joel Sartore / Photo Ark / Sri Lankan brown fish-owl (Ketupa zeylonensis zeylonensis) head portrait, Monticello Center. Captive, occurs in Sri Lanka.

Joel Sartore / Photo Ark / Sri Lankan brown fish-owl (Ketupa zeylonensis zeylonensis) portrait, Monticello Center. Captive, occurs in Sri Lanka.

Andy Rouse / RF - Brown fish owl (Ketoupa zeylonensis) fishing in shallow water, Ranthambhore, India. (This image may be licensed either as rights managed or royalty free.)

Andy Rouse / Brown fish owl (Ketoupa zeylonensis) fishing in shallow water, Ranthambhore, India.

Andy Rouse / Brown fish owl (Ketoupa zeylonensis) fishing in shallow water, with nictitating membrane visible on one eye, Ranthambhore, India.

Andy Rouse / Brown fish owl (Ketoupa zeylonensis) fishing in shallow water, Ranthambhore, India.

Andy Rouse / Brown fish owl (Ketoupa zeylonensis) spreading wings whilst fishing in shallow water, Ranthambhore, India.

Andy Rouse / Brown fish owl Ketoupa zeylonensis) perched on branch, drying off after fishing, Ranthambhore, India.

Christophe Courteau / Pel's fishing owl (Scotopelia peli) juvenile perched on branch at night, Okavango Delta. Botswana.

Christophe Courteau / Pel's fishing owl (Scotopelia peli) juvenile at night, head portrait, Okavango Delta, Botswana.

Joel Sartore / Photo Ark / Pel's fishing owl (Scotopelia peli) looking up towards camera, Monticello Center, Italy. Captive.

Joel Sartore / Photo Ark / Sri Lankan brown fish owl (Ketupa zeylonensis zeylonensis) looking towards camera, Monticello Center, Italy. Captive.

Joel Sartore / Photo Ark / Pel's fishing owl (Scotopelia peli) looking towards camera, Monticello Center, Italy. Captive.

Sylvain Cordier / Brown fish owl (Ketupa zeylonensis) perched in tree. Jim Corbett National Park, Uttarakhand, India.