. Distribution and abundance of winter populations of bald eagles in Illinois. Bald eagle. February 1988 Havera and Kruse: Winter Populations of Bald Eagles Table 3.âWinter bald eagle counis (ondii couiu, 1957-1987. (1 \n the lllin()i> Natural Hisiorv Survey. KUon hawks, and the .Audubon Christmas bird INHS Fawk s'' Audubon''''- ^ear .\duli liiiinalure lolal .â¢\(luli Itninaturc L'nascd lolal .^duh Immature Unaged total ) 7 359 207 1960 (i3 1961 142 30 172 365 51 1 417 1962 143 44 187 417 62 29 508 1963 108 64 172 331 91 7 429 1904 68 30 98 226 58 130 414 196-) ".â ) 52 127&q
. Distribution and abundance of winter populations of bald eagles in Illinois. Bald eagle. February 1988 Havera and Kruse: Winter Populations of Bald Eagles Table 3.âWinter bald eagle counis (ondii couiu, 1957-1987. (1 \n the lllin()i> Natural Hisiorv Survey. KUon hawks, and the .Audubon Christmas bird INHS Fawk s'' Audubon''''- ^ear .\duli liiiinalure lolal .â¢\(luli Itninaturc L'nascd lolal .^duh Immature Unaged total ) 7 359 207 1960 (i3 1961 142 30 172 365 51 1 417 1962 143 44 187 417 62 29 508 1963 108 64 172 331 91 7 429 1904 68 30 98 226 58 130 414 196-) ".â ) 52 127" 420 160 44 624 1966 486 122 51 659 1967 485 175 28 688 196H 84 37 121'' 415 174 50 639 1969 391 261 3 655 1970 112 76 188 1971 100 40 140 406 159 11 576 1972 75 19 94 .562 302 31 895 158 95 29 282 1973 364 175 539 529 231 14 774 211 115 14 340 1974 398 153 551 413 128 8 549 140 113 3 1973 365 201 566 519 274 32 825 304 182 110 596 1976 489 270 759 459 214 33 706 287 269 6 562 1977 327 144 471 508 264 29 801 405 252 11 668 1978 369 166 535 69() 219 52 967 503 â¢247 11 761 1979 410 203 613 1,018 356 30 244 149 10 403 1980 514 288 802 931 4()(i 57 1,394 384 203 7 594 1981 454 304 758 228 153 5 386 1982 517 271 788 888 380 28 211 128 3 342 1983 365 178 543 292 256 17 565 1984 613 317 930 316 218 3 537 404 247 651 420 235 12 667 1986 779 438 443 313 11 767 1987 368 201 569 â 'Kawks (1983). ''Struihcrs (1973. 1974, 1975, 1976, \'.r, 'Stroyls (1981, 1982, I9H3, 1984, 1985. ' Incomnlele count. 7, 1978, 1979, 1980). 1986, 1987). counts are presented in Figure 5. Each of the three inventories shows a general trend toward higher num- bers in recent years. As noted by Fawks (198S), weatli- er and other factors that interfere with ac( urate counts are of lesser importance if data interpretation is based on multi-year averages rather than one-year totals, (founts by the Illinois Audubon Society were probably also influented by changes in geographical
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