Bruce Thomson / Grey falcon (Falco hypoleucos) perching near nest in Eucalypt tree, Diamantina River, Queensland, Australia.

Bruce Thomson / Grey falcon (Falco hypoleucos) perching near nest in Eucalypt tree, Diamantina River, Queensland, Australia.

MYN / Gil Wizen / Huge terrestrial flatworm (Bipalium kewense), Mindo, Ecuador, March. meetyourneighbours.net project

Duncan Murrell / Land Planarian - flat worm, (Bipalium sp.) on a wild banana tree, Gunung Mulu National Park, UNESCO World Heritage Site, Sarawak, Malaysian Borneo.

Emanuele Biggi / Hammerhead worms (Bipalium sp) on leaf, Sarawak. Borneo.

Alex Hyde / Terrestrial flatworm (Planariidae) Danum Valley, Sabah, Borneo.

Alex Hyde / Terrestrial flatworm (Planariidae) resting in colied position. Danum Valley, Sabah, Borneo.

Alex Hyde / Terrestrial flatworm (Planariidae) Danum Valley, Sabah, Borneo.

Alex Hyde / Terrestrial flatworm (Planariidae) Danum Valley, Sabah, Borneo.

Alex Hyde / Land planarian (Geoplanidae) Central Caribbean foothills, Costa Rica

Jan Hamrsky / Flatworm egg capsule on stalk (Dugesia gonocephala), Europe, July. Controlled conditions.

Jan Hamrsky / Flatworm (Dugesia gonocephala), Europe, July. Controlled conditions.

Jan Hamrsky / Freshwater flatworm (Polycelis nigra), Europe, June. Controlled conditions.

Jan Hamrsky / Flatworm (Dugesia sp) Europe, December, controlled conditions.

Jan Hamrsky / Flatworm (Dugesia sp) Europe, December, controlled conditions.

Pete Oxford / Flat worm on tree bark {Tricladida} Madagascar

Emanuele Biggi / Land flatworm (Diversibipalium sp.) crawling over a fallen leaf in the leaf litter of a primary forest, Mulu National Park, Sarawak, Borneo.

Chris Mattison / Australian flatworm (Australoplana sanguinea) on sphagnum moss (Sphagnum sp.), introduced predatory flatworm found in several parts of UK. Feeds on earthworms and considered a pest of agriculture/hort...

Chris Mattison / Australian flatworm (Australoplana sanguinea) on Sphagnum moss (Spagnum sp.) introduced predatory flatworm found in several parts of UK. Feeds on earthworms and considered a pest of agriculture/hortic...

Joao Burini / Flatworm (Geoplaninae) preying on Harvestman (Gagrellinae) Southeastern Atlantic Forest, Mantiqueira Mountain Range, Sao Francisco Xavier, Sao Paulo, Brazil.

Joao Burini / Flatworm (Geoplaninae) on a mossy tree trunk, Southeastern Atlantic Forest, Mantiqueira Mountain Range, Sao Francisco Xavier, Sao Paulo, Brazil.

Alex Hyde / Hammerhead flatworm (Geoplanidae), Danum Valley, Sabah, Borneo.

Alex Hyde / Hammerhead flatworm (Geoplanidae), Danum Valley, Sabah, Borneo.

Karine Aigner / Portrait of a flatworm (Pseudogeoplana) on a dead leaf at night, Mindo, Ecuador.

Karine Aigner / Portrait of a flatworm (Pseudogeoplana) on a dead leaf at night, Mindo, Ecuador.

Jan Hamrsky / Freshwater flatworm (Dugesia gonocephala) on dead leaf, Europe, April, controlled conditions

Jan Hamrsky / Freshwater flatworm (Dugesia gonocephala) on dead leaf, Europe, April, controlled conditions

Jan Hamrsky / Freshwater flatworm (Dugesia gonocephala) on dead leaf, Europe, April, controlled conditions

Will Watson / New Zealand Flatworm (Arthurdendyus trianguluatus), invasive species, County Down, Northern Ireland October 2019.