Clover Grass vs Common Seal

Halophila baillonii compared with Phoca vitulina

Key Differences

• Clover Grass is Vulnerable while Common Seal is Near Threatened.

Taxonomic Classification

Rank	Clover Grass	Common Seal
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Magnoliophyta (Flowering Plants)	Chordata (Chordates)
Class	Liliopsida (Monocots)	Mammalia (Mammals)
Order	Alismatales (Alismatales)	Pinnipedia (Seals & Sea Lions)
Family	Hydrocharitaceae	Phocidae (True Seals)
Genus	Halophila	Phoca (Harbor Seals)
Species	Halophila baillonii	Phoca vitulina

Conservation Status

Clover Grass

VU — Vulnerable

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Physical Characteristics

Attribute	Clover Grass	Common Seal
Diet	—	Carnivore
Average Lifespan	—	30 years
Average Length	—	1.7 m
Average Weight	—	80.0 kg

Habitat & Geographic Range

Clover Grass

Habitat

Typically found in grasslands, wetlands, forests, and cultivated landscapes.

Common Seal

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Found across Europe (7 countries) and North America (United States). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Clover Grass

Halophila baillonii, commonly known as clover grass or simply Halophila, is a small marine seagrass in the family Hydrocharitaceae, order Alismatales. Despite its vernacular name suggesting a terrestrial grass, it is fully aquatic, inhabiting tropical and subtropical shallow marine waters. H. baillonii grows primarily in the Caribbean Sea and Western Atlantic, occurring across island and coastal areas where warm, shallow, clear water and suitable substrate are available. The species forms low-growing meadows of oval to heart-shaped leaf pairs emerging from creeping rhizomes, reaching only a few centimeters in height. As a seagrass, it occupies a critical ecological role in shallow coastal marine ecosystems, providing habitat and feeding grounds for sea turtles, dugongs, fish, and invertebrates, as well as stabilizing sediments and cycling nutrients. H. baillonii is one of the smaller seagrass species and is found growing on sandy, silty, and sometimes rocky substrates in lagoons, reef flats, and sheltered bays at depths ranging from the intertidal zone to approximately fifteen meters. The species is dioecious — with male and female flowers borne on separate plants — and reproduces both sexually and through vegetative spread. H. baillonii is classified as Vulnerable on the IUCN Red List, with populations threatened by coastal development, water quality degradation, increased turbidity, and climate-related changes including sea temperature rise and ocean acidification, which stress shallow seagrass ecosystems throughout the Caribbean region.

Common Seal

The most widely distributed pinniped, harbor seals inhabit temperate and subarctic coastal waters of both the North Atlantic and North Pacific. Adults reach up to 130 kg and spend roughly equal time at sea hunting fish, squid, and crustaceans and hauling out on beaches or rocks to rest. Their large, expressive eyes are adapted for underwater vision in low light. Harbor seals are a critical food source for orcas, sharks, and polar bears.