All right here is what I have so far.
Under "Sexing": "...making the only reliable way to determine the gender is to have a DNA test" is grammatically improper. Corrected example: "...making a DNA test the only reliable way to determine gender".
Under "Geography/Habitat": "mosaic" is misspelled as "mossaic".
Under "Diet": the sentence "In captivity, it usually is common for them to eat including fruits" is missing words. Corrected example: In captivity, it is common for them to eat a diet including fruits," etc. The word "usually" is unnecessary when followed by "common", which is more or less synonymous.
Under "Breeding": (The section is grouped with Conservation Status unintentionally, and should be spaced apart like the other sections.) The sentence "Almost all of the Senegals after then have been bred in captivity and since then, they have become more popular in aviculture" seems awkward. Corrected example: "Almost all Senegals have been bred in captivity since then, and have become more popular in aviculture."
Under "Pet Satus": "These birds are very good companions as they are not very loud and with a personality of a bigger bird." Corrected example: "These birds are very good companions, as they are not very loud and have the personality of a bigger bird." Also, the sentence "While they are pretty small, they are little feisty creatures" is not needed and is oddly phrased. Perhaps "While they are small birds, they are fiesty" or something similar.
Under "Petting": (Possibly change to "Handling/Grooming"? "Petting" seems far too general.) The sentence "They also sometimes scratches itself with its foot" is wrong. Corrected example: "They also sometimes scratch themselves with their feet".
Under "Biting": The sentence "Sometimes the bird nips or squeezes a finger to show displeasure of something, to which the owner/handler should ignore the nip in order to not reinforce the behavior" is worded improperly. Corrected example: "Sometimes the bird nips or squeezes a finger to show displeasure of something. The owner/handler should respond to this by ignoring the nip in order to not reinforce the behavior." Also, the phrase "infiltrated into its territory" should simply read "infiltrated its territory".
Hope this helps.