Chordata - "Chord"
Frog (Amphibias)
Mating for amphibians must nearly always occur in fresh water. It consists of the joining of the male and female frog, and at this time, the female lays eggs while the male releases sperm. The fertilized eggs are now left alone by both parents. The young that hatch will survive on their own.
Amphibian eggs are protected by a jelly-like substance before hatching, unlike the hard or semi-hard shells of reptiles and birds.
Amphibian eggs are protected by a jelly-like substance before hatching, unlike the hard or semi-hard shells of reptiles and birds.
Lizard (Reptilias)
In reptiles, egg fertilization occurs internally when the male places his sperm inside eggs within the female's body. The male does this by inserting his penis into the female cloaca. In many species, this sperm can remain intact for years so the female can produce additional offspring without any other male contact. Interestingly, some species of lizards actually produce offspring without males in a process known as parthenogenesis.
Flagfish (Fish)
When an egg-laden female comes by, they do a rough courtship dance that looks like a milder version of fighting. Then, the male curves over the female in a horsehoe-shape. As the female releases her eggs, the male immediately fertilizes them. The female lays an average of 350 eggs, but usually not all of them will survive. The female will drift as if stunned, while the male places the fertilized eggs in each of the bubbles of the bubblenest. They can repeat all of this for up to one day.
Oriel (Birds)
Birds reproduce by sexual reproduction. Many birds have courtship rituals. Male and female birds from many bird species develop pair bonds. They actually remain with one another throughout the reproductive season. The male bird's sexual organs consist of paired testis. The female bird's sexual organs consist of only a left ovary and oviduct. This left ovary and oviduct is the only functional ovary that the female birds have.
Tiger (Mammals)
The female tiger's estrous cycle varies from 3 to 9 weeks in length. She is able to conceive for between 3 and to 6 days per cycle and indicates that she is in this stage of the cycle by rolling, pacing and roaring. If a female tiger consents, the male tiger holds onto the back of her neck with his teeth and the pair mate. Tigers produce a number or of vocalized noises when mating and may they might mate several times in a single day.
Mark Mostarac