"by the same individual" is correct and usable in written English.
For example, "The same mistakes were repeated by the same individual."
Birds visiting the feeders were not individually marked and so multiple visits by the same individual could not be accounted for but all sites were treated equally.
Self-fertilization, fusion of male and female gametes (sex cells) produced by the same individual.
These territories may be used from one year to the next by the same individual (Wagner 1945).
Animals in which both sperm and eggs are produced by the same individual (hermaphroditism) are termed monoecious.
"Obviously, the prints were not made by the same individual," Carl Carlson of the Kansas City Police Department said at a news conference.
(b) Histogram of time elapsed between end of one chase and end of next chase by the same individual (n=1,119).
There is an ALS (a letter hand-written and signed by the same individual) from William Magear "Boss" Tweed (1823-1878) to a correspondent dated 1869.
Our results show that firms appearing in chronologically adjacent searches by the same individual (Search Based Peers or SBPs) are fundamentally similar on multiple dimensions.
Models of territorial defence tend to omit two characteristics of many territorial systems: repeated intrusions by the same individual and the learning processes of residents and intruders.
Certain robes indicate a position in the hierarchy; others correspond to function and may be worn by the same individual at different times.
Some organisms, such as most flowering plants, earthworms, and tunicates, are bisexual (hermaphroditic, or monoecious)—i.e., both the male and female gametes are produced by the same individual.
