しかし、多くの点で珍しい鳥である。というのは彼は、かつて科学者達が人間にしかないと思っていた種の知的能力を示しているのである。

Sentence Analyzer

しかし 多く 珍しい ある という かつて 科学者達 人間 しか ない 思っていた 知的 能力 示している ある

English Translation

But in many ways, the bird called Alex is unusual, for it has shown the kind of mental abilities that scientists once thought only humans had.

Furigana

しかし、(おお)くの(てん)(めずら)しい(とり)である。というのは(かれ)は、かつて科学者達(かがくしゃたち)人間(にんげん)にしかないと(おも)っていた(たね)知的(ちてき)能力(のうりょく)(しめ)しているのである。

Romanji

Shikashi, ōku no ten de mezurashii tori de aru. toiu no wa kare wa, katsute kagakushatachi ga ningen ni shika nai to omotteita tane no chiteki nōryoku o shimeshiteiru no de aru.

Words

然し (しかし)
however; but
多く (おおく)
many; much; largely; abundantly; mostly
()
indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question
(てん)
spot; mark; point; dot; mark (e.g. in exam); score; points; comma; aspect; matter; respect; counter for goods, items, articles of clothing, works of art, etc.
()
be; is; indicates past or completed action; indicates light imperative
珍しい (めずらしい)
unusual; rare; curious; new; novel; fine (e.g. gift)
(とり)
bird; bird meat (esp. chicken meat); fowl; poultry
(ある)
a certain ...; some ...
と言う (という、とゆう)
called; named; as many as; as much as; all X; every X
()
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
(かれ)
he; him; his; boyfriend
嘗て (かつて、かって)
once; before; formerly; ever; former; ex-; never yet; never before; first time; still not happened
()
indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
人間 (にんげん)
human being; person; man; mankind; humankind; character (of a person)
()
at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although
しか (しか)
only; nothing but
ない (ない)
not; emphatic suffix
()
if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)
思う (おもう)
to think; to consider; to believe; to think (of doing); to plan (to do); to judge; to assess; to regard; to imagine; to suppose; to dream; to expect; to look forward to; to feel; to desire; to want; to recall; to remember
(たね)
seed; pip; kind; variety; quality; tone; material; matter; subject; theme; (news) copy; leaven (bread); cause; source; trick; secret; inside story
知的 (ちてき)
intellectual
能力 (のうりょく)
ability; faculty
()
indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.
示す (しめす)
to (take out and) show; to demonstrate; to tell; to exemplify; to make apparent; to point out (finger, clock hand, needle, etc.); to indicate; to show; to represent; to signify; to display

Kanji

Readings: タ、 おお.い、 まさ.に、 まさ.る
Meanings: many, frequent, much
Readings: テン、 つ.ける、 つ.く、 た.てる、 さ.す、 とぼ.す、 とも.す、 ぼち
Meanings: spot, point, mark, speck, decimal point
Readings: チン、 めずら.しい、 たから
Meanings: rare, curious, strange
Readings: チョウ、 とり
Meanings: bird, chicken
Readings: ヒ、 かれ、 かの、 か.の
Meanings: he, that, the
Reading: 
Meanings: department, course, section
Readings: ガク、 まな.ぶ
Meanings: study, learning, science
Readings: シャ、 もの
Meanings: someone, person
Readings: タツ、 ダ、 -たち
Meanings: accomplished, reach, arrive, attain
Readings: ジン、 ニン、 ひと、 -り、 -と
Meaning: person
Readings: カン、 ケン、 あいだ、 ま、 あい
Meanings: interval, space
Readings: シ、 おも.う、 おもえら.く、 おぼ.す
Meaning: think
Readings: シュ、 たね、 -ぐさ
Meanings: species, kind, class, variety, seed
Readings: チ、 し.る、 し.らせる
Meanings: know, wisdom
Readings: テキ、 まと
Meanings: bull's eye, mark, target, object, adjective ending
Readings: ノウ、 よ.く
Meanings: ability, talent, skill, capacity
Readings: リョク、 リキ、 リイ、 ちから
Meanings: power, strength, strong, strain, bear up, exert
Readings: ジ、 シ、 しめ.す
Meanings: show, indicate, point out, express, display