Baleen is a substance made of keratin (the protein that makes up human fingernails). Baleen whales have as many as 600 plates of baleen in their upper jaws. Whales strain seawater through the baleen, and hairs on the baleen capture fish, shrimp, and plankton. The salt water then flows bac...
Similarities Between All Whales - the Cetaceans All of the cetaceans have a streamlined body and adaptations for living in the water and never coming onto land. But whales are mammals, not fish. They are related to land mammals, such as the hippopotamus. They are descended from land animals ...
Energy and time allocation in avian parents may greatly differ between consecutive stages of breeding and sexes, due to different parental activities and associated constraints. Parental care, including incubation and chick rearing, is considered as a demanding period for most birds because adults must ...
The main difference between a blue whale and a whale shark is the biological classification. A blue whale is classified as a cetacean meaning that it is a true mammal and a member of the family of whales. A whale shark on the hand is classified as a true fish and a member of the sha...
We tested the hypotheses that dive rates (no. of dives/h greater than or equal to specific depths) of fish-eating killer whales varied between males and females, with age, between day and night, and among pods and years. Data were used from 34 TDR deployments between 1993 and 2002 in ...
Energy and time allocation in seabirds differ between consecutive stages of breeding given various requirements of particular phases of the reproductive period. Theses allocations may also be sex-specific considering differential energetic or nutritional
Factors influencing the diving behaviour of fish2eating killer whales : sex differences and diel and interannual variation in diving rates. Can. J . Zool . 83 : 257 - 267.Baird RW, Hanson MB, Dill LM (2005a) Factors influencing the diving behaviour of fish-eating killer whales: sex ...
Here, we analysed the interactions between humans and cetaceans when free-ranging orcas approach divers. Our study concentrated on the spontaneous exploratory behaviours of divers by orcas depending on their age and sex, and on the possible expression of a visual laterality. The results showed a ...
We then tested pupal size41,42, adult weight42and starvation resistance43. These characteristics display differences between males and females. The molecular and cellular mechanisms driving these dimorphisms are still incompletely understood and the impact of the Y chromosome size have never been tested...
aAquatic vertebrates must obtain oxygen to survive, and they do so in various ways. Fish have gills instead of lungs, although some species of fish, such as the lungfish, have both. Marine mammals, such as dolphins, whales, otters, and seals need to surface periodically to breathe air. So...