Michel Roggo / Water hyacinth (Eichhornia sp.) in a clear stream of the Pantanal, Brazil. Photographed for The Freshwater Project. Finalist in the Wildlife Photographer of the Year Awards (WPOY) Competition 2017.

Rolf Nussbaumer / Water hyacinth covering lake {Eichhornia crassipes} Texas, USA.

Fred Bavendam / West Indian Manatee (Trichechus manatus) eating Hydrilla (Hydrilla sp) an introduced plant that often clogs waterways, Blue Spring State Park, Florida

Tony Heald / Hippopotamus (Hippopotamus Amphibius) grazing with Water hyacinth on back after coming out of water. Mana Pools National Park. Zimbabwe.

Heather Angel / Channelled apple snail (Pomacea canaliculata) laid on Water hyacinth (Eichhornia crassipes) leaves, both invasive species, native to South America. Yangshuo, Guangxi Zhuang Autonomous Region, China.

Mark Taylor / Vegetation including Water hyacinth growing in the Miranda River, Pantanal area of Brazil. Mato Grosso do Sul, Brazil. May 2018.

Franco Banfi / Split level view of Water hyacinth, (Eichhornia sp.), in a spring close to Bonito, Mato Grosso do Sul, Brazil

Franco Banfi / Split level view of Water hyacinth, (Eichhornia sp.), in a spring close to Bonito, Mato Grosso do Sul, Brazil

Franco Banfi / Water hyacinth, (Eichhornia sp.), from below the surface, Paraguay River, Pantanal, Brazil

Staffan Widstrand / Wild Wonders of China / Water hyacinth (Eichhornia crassipes) and bees at Tongbiguan Nature Reserve, Dehong prefecture, Yunnan province, China. May

Sylvain Cordier / Hyacinth Macaw (Anodorhynchus hyacinthinus) adult, drinking from a pond, Pantanal, Mato Grosso, Brazil.

Michel Roggo / Spring creek at very high water level, tributary of floodplain river Rio Miranda. With aquatic plants mainly Water hyacinth (Eichhornia sp.) Pantanal, Mato Grosso do Sul, Brazil. November. Photograp...