Rostrum is a term for hard beak-like structures projecting from animal heads. Many rostrum structures are phylogenetically unrelated in different species
Swans are waterfowl with incredible speed and agility. They can reach speeds of 22 mph on land and 1.6 mph in water. Six living species exist, including black, mute, and trumpeter swans. Males are larger than females but share similar plumage
Placozoans are the world's simplest animals, with only two tissue layers. Sponges filter seawater and lack organs, with about 10,000 species. Flatworms display bilateral symmetry but lack specialized systems. Mesozoans are microscopic parasites of other marine invertebrates
Chimpanzees are considered most intelligent primates but still lag behind humans. Orangutans demonstrate advanced tool use and environmental understanding. Great apes like chimpanzees and orangutans show human-like problem-solving abilities
Parasitism is a relationship where one species benefits at the expense of another. Ectoparasites live on host's surface and don't usually cause disease. Endoparasites can be intracellular or intercellular, often transmitted by vectors
Insects have a global population of 10 quintillion individuals. Fish comprise 3.5 trillion individuals across 32,000 species. Birds are estimated at 50 billion individuals across 10,000 species. Reptiles have over 10,000 species globally. Sea anemones have over 1,000 known species