Summary: Frogs belong to amphibians of the family Apiaceae, adult tailless, eggs laid in the water, in vitro fertilization, hatched into tadpoles, breathed with gills, after mutation, adults mainly breathe with lungs, combined with skin breathing, insects and other invertebrates as the main food, almost all are experts at eliminating forest and farmland pests, let's take a look at the frog's data collection!
Frogs belong to amphibians of the family Apiaceae, adults have no tails, eggs are laid in the water, in vitro fertilization, hatched into tadpoles, breathed with gills, after mutation, adults mainly breathe with lungs, combined with skin breathing, insects and other invertebrates as the main food, almost all of them are experts at eliminating forest and farmland pests, let's take a look at the frog's data collection!
The living environment of frogs
Frogs are warm animals, bare skin, can not effectively prevent the evaporation of water in the body, a lifetime can not be separated from water or humid environment, afraid of drought and cold, most of them live in tropical and temperate rainy areas, distributed in the cold zone of very few species, when they are young can only live in water, when they grow up, they can also live on land. The respiratory organs of frogs are the lungs and skin, and the respiratory organs of juvenile tadpoles are gills.
The structure of the frog's tongue
The frog's tongue is rooted at the tip of the mouth, the tip of the tongue is inward, and there is mucus on the tongue to facilitate catching insects, and it blinks when swallowing food, and the eyes and face are closed to the bottom up. Frogs are omnivorous animals, of which plant foods account for only about 7% of the diet, animal foods account for about 93% of the diet, the main foods are rice roll leafworm, rice borer, rice bud, armyworm, corn borer, cotton red bollworm, ping gray borer, eyebrow mosquito nocturnal moth, rice eye butterfly, rice negative mud worm, rice weevil, scarab beetle, ladybug, white-backed planthopper, gray-backed planthopper, rice black lice, brown-backed planthopper, rice leafminer fly, ping shaking mosquito, fruit fly, mosquito, mosquito and so on.
Reproductive development of frogs
Frogs are hermaphrodites, in vitro fertilization, sperm and egg cells in the water to complete fertilization, fertilized eggs hatched into tadpoles, newly hatched tadpoles have a flat and long tail, with the gills on both sides of the head to breathe, growing the tadpoles of the inner gills, shaped like a fish, baby babies with limbs, breathing with lungs, bare skin, auxiliary breathing, baby babies gradually develop into frogs, the development process is fertilized eggs→ tadpoles → frogs → into frogs.
The optic nerve of the frog
The nerve cells of the frog eye retina are divided into five categories, one only responds to color, the other four only respond to a certain feature of the moving target, and can transmit the decomposed feature signal to the visual center of the brain - the ceiling cover, there are four layers of nerve cells on the ceiling cover, the first layer responds to the contrast of the moving target, the second layer can extract the convex edge of the target, the third layer only sees the four edges of the target, and the fourth layer only cares about the light and dark changes of the dark leading edge of the target, these four layers of features are like drawings on four transparent papers. Stacked together, it's a complete image. Thus, in the rapidly flying small animals of various shapes, the frog can immediately identify its favorite flies and moths, and does not react to other flying things or stationary scenes.
Morphological characteristics of frogs
1, the head: frog head flat, slightly triangular, the snout is slightly pointed, the mouth is wide, transversely split, composed of upper and lower jaws, the dorsal front of the upper jaw has 1 external nostril, the outer edge of the outer nostril has a nasal flap, the eyes are large and prominent, born on the left and right sides of the head, with the upper and lower eyelids, and there is a translucent transient membrane on the inside of the lower eyelid. The male frog has a pale brown capsule in the inner and posterior corners of the mouth as a vocal sac, which bulges into a bubble when it calls.
2. Trunk: after the tympanic membrane of the frog is the trunk, the trunk is short and wide, and between the legs at the rear end of the torso, there is a small hole on the dorsal side, which is a cloaca hole.
3, limbs: the forelimbs of frogs are short, composed of five parts of the upper arm, forearm, wrist, palm and finger, 4 fingers, no webbing between the fingers, and there is a large protrusion on the inside of the first finger of the male frog in the reproductive season, called the marriage tumor, for the right use. The hind limbs of the frog are long and well developed, divided into femoral, tibia, tarsal, tarsal, and toe, with five toes, webbing between the toes, and a stiff keratinized distance on the inside of the first toe.