Estimated South American beaver population 1946 - 2050

U.S. Fish and Wildlife Service

1. In 1946, to start a fur industry, the government of Argentina imported 50 Canadian beavers and set them loose on an island in Tierra del Fuego.

2. The beavers have no natural predators in their new habitat, and are thriving in vast forests.

3. They have already swum to adjacent islands and established new colonies. Biologists fear they will swim to the South American mainland.

4. The beavers are now multiplying at an annual rate of 20%.

year ..... beavers
==================
1946 .......... 50
1947 .......... 60
1948 .......... 72
1949 .......... 86
1950 ......... 103
1951 ......... 124
1952 ......... 149
1953 ......... 179
1954 ......... 214
1955 ......... 257
1956 ......... 309
1957 ......... 371
1958 ......... 445
1959 ......... 534
1960 ......... 641
1961 ......... 770
1962 ......... 924
1963 ....... 1,109
1964 ....... 1,331
1965 ....... 1,597
1966 ....... 1,916
1967 ....... 2,300
1968 ....... 2,760
1969 ....... 3,312
1970 ....... 3,974
1971 ....... 4,769
1972 ....... 5,723
1973 ....... 6,868
1974 ....... 8,242
1975 ....... 9,890
1976 ...... 11,868
1977 ...... 14,242
1978 ...... 17,091
1979 ...... 20,509
1980 ...... 24,611
1981 ...... 29,533
1982 ...... 35,440
1983 ...... 42,528
1984 ...... 51,033
1985 ...... 61,240
1986 ...... 73,488
1987 ...... 88,186
1988 ..... 105,823
1989 ..... 126,988
1990 ..... 152,386
1991 ..... 182,863
1992 ..... 219,436
1993 ..... 263,323
1994 ..... 315,988
1995 ..... 379,185
1996 ..... 455,022
1997 ..... 546,027
1998 ..... 655,232
1999 ..... 786,279
2000 ..... 943,535
2001 ... 1,132,242
2002 ... 1,358,691
2003 ... 1,630,429
2004 ... 1,956,515
2005 ... 2,347,818
2006 ... 2,817,382
2007 ... 3,380,859
2008 ... 4,057,031
2009 ... 4,868,437
2010 ... 5,842,125
2011 ... 7,010,550
2012 ... 8,412,660
2013 .. 10,095,193
2014 .. 12,114,232
2015 .. 14,537,079
2016 .. 17,444,496
2017 .. 20,933,396
2018 .. 25,120,076
2019 .. 30,144,093
2020 .. 36,172,913
2021 .. 43,407,497
2022 .. 52,088,999
2023 .. 62,506,801
2024 .. 75,008,165
2025 .. 90,009,801
2026 . 108,011,766
2027 . 129,614,124
2028 . 155,536,956
2029 . 186,644,354
2030 . 223,973,234
2031 . 268,767,892
2032 . 322,521,483
2033 . 387,025,795
2034 . 464,430,972
2035 . 557,317,189
2036 . 668,780,654
2037 . 802,536,816
2038 . 963,044,218
2039 1,155,653,108
2040 1,386,783,784
2041 1,664,140,608
2042 1,996,968,809
2043 2,396,362,666
2044 2,875,635,313
2045 3,450,762,513
2046 4,140,915,180
2047 4,969,098,414
2048 5,962,918,333
2049 7,155,502,285
2050 8,586,603,083