Sponges have very few predators primarily due to their physical structure and chemical defenses. Their porous bodies and rigid spicules make them difficult to consume, while many species produce toxic or distasteful compounds that deter potential predators. Additionally, their ability to regenerate quickly after damage makes them less appealing targets for predation. As a result, they occupy a relatively safe niche in marine ecosystems.
Some possible predators of the basilosaurus were the shastasaurus, the dunkleosteus, and the elamosaurus. The basilosaurus was very large and had very few predators.
They mostly prey on craby patties.
Spicules
spongin and spicules are the sponges body support and defence
Sponges have a variety of defenses against predators, including producing toxins, secreting a distasteful substance, releasing mucous to trap predators, and being able to quickly regenerate if damaged. Some sponges can also contract or close their pores to protect themselves.
Spongin is a tough, fibrous protein that provides structural support to sponges, making them difficult to consume. Spicules are tiny, needle-like structures made of calcium carbonate or silica that can be sharp and harmful if ingested by predators. Together, these structures make sponges unpalatable and unattractive to most predators.
Sponges are asymmetrical, although a few species have nearly radial symmetry.
Sea Sponges hide from there predators by either camouflaging themselves or either not hiding at all.
They have very few predators. The natural predators are birds and larger fish. Their unnatural predators are humans, because the are caught and sold on the market as food or as pets.
Giant Pandas have very few predators. Humans are their primary predators, though animals such as leopards are also predators mostly of cubs. The largest threat to them though is not predators, but habitat loss.
Purple tube sponges have few natural enemies due to their chemical defenses and habitat preferences. However, they may be consumed by some predators, such as sea urchins, certain nudibranchs, and some fish species. Overcrowding and competition for space with other filter feeders can also pose a threat to purple tube sponges.
Tarantulas in general have few predators. Some include snakes, scorpions, wasps, lizards, birds, and, well, humans. But very few are the tarantulas that become meals.