By Cyril di Bisceglie - https://commons.wikimedia.org/w/index.php?curid=69094027
Walvis Dolphin Dolfyn
Despite being widely spread throughout the world's deep tropical and subtropical regions, melon-headed whales are rarely seen at sea. They are extremely rare around South African waters. Only one stranding has taken place along the South African coast.
Melon-headed whales have a dolphin-shaped body. Melon-headed whales can reach lengths of 2.75 m (9.0 ft) and weights of up to 225 kg (496 lb) and they can live up to 45 years.
Being a very sociable species, melon-headed whales frequently travel in herds of 100–500 individuals, with sporadic sightings of herds as large as 1000–2000 individuals.
Large sharks and killer whales prey on Melon-headed whales.
Melon-headed whales seem to be one of the more susceptible species to mid-frequency sonar (1 to 10 kHz), utilized in military operations and other types of sonar. A symptom in the past was stranding incidents, associated with sonar.
Sources:
(*) https://en.wikipedia.org/wiki/Melon-headed_whale(*) https://www.inaturalist.org/taxa/41543-Peponocephala-electra
(*) https://animalia.bio/melon-headed-whale